src/cpl_query/__init__.py

@@ -15,7 +15,7 @@ __title__ = 'cpl_query'
 __author__ = 'Sven Heidemann'
 __license__ = 'MIT'
 __copyright__ = 'Copyright (c) 2021 - 2022 sh-edraft.de'
-__version__ = '2022.10.2'
+__version__ = '2022.10.9'
 
 from collections import namedtuple
 
@@ -23,4 +23,4 @@ from collections import namedtuple
 # imports:
 
 VersionInfo = namedtuple('VersionInfo', 'major minor micro')
-version_info = VersionInfo(major='2022', minor='10', micro='2')
+version_info = VersionInfo(major='2022', minor='10', micro='9')

src/cpl_query/base/__init__.py

@@ -0,0 +1,26 @@
+# -*- coding: utf-8 -*-
+
+"""
+cpl-query sh-edraft Common Python library Query
+~~~~~~~~~~~~~~~~~~~
+
+sh-edraft Common Python library Python integrated Queries
+
+:copyright: (c) 2021 - 2022 sh-edraft.de
+:license: MIT, see LICENSE for more details.
+
+"""
+
+__title__ = 'cpl_query.base'
+__author__ = 'Sven Heidemann'
+__license__ = 'MIT'
+__copyright__ = 'Copyright (c) 2021 - 2022 sh-edraft.de'
+__version__ = '2022.10.9'
+
+from collections import namedtuple
+
+
+# imports:
+
+VersionInfo = namedtuple('VersionInfo', 'major minor micro')
+version_info = VersionInfo(major='2022', minor='10', micro='9')

src/cpl_query/base/queryable_abc.py

@@ -1,29 +1,11 @@
-from abc import ABC, abstractmethod
+from abc import abstractmethod, ABC
-from typing import Optional, Callable, Union, Iterable
+from typing import Optional, Callable, Union
 
 
-class IterableABC(ABC, list):
+class QueryableABC(ABC):
-    r"""ABC to define functions on list
-    """
 
     @abstractmethod
-    def __init__(self, t: type = None, values: list = None):
+    def all(self, _func: Callable = None) -> bool:
-        list.__init__(self)
-
-        if t == any:
-            t = None
-        self._type = t
-
-        if values is not None:
-            for value in values:
-                self.append(value)
-
-    @property
-    def type(self) -> type:
-        return self._type
-
-    @abstractmethod
-    def all(self, func: Callable) -> bool:
         r"""Checks if every element of list equals result found by function
 
         Parameter
@@ -38,7 +20,7 @@ class IterableABC(ABC, list):
         pass
 
     @abstractmethod
-    def any(self, func: Callable) -> bool:
+    def any(self, _func: Callable = None) -> bool:
         r"""Checks if list contains result found by function
 
         Parameter
@@ -52,24 +34,8 @@ class IterableABC(ABC, list):
         """
         pass
 
-    def append(self, __object: object) -> None:
-        r"""Adds element to list
-
-        Parameter
-        ---------
-            __object: :class:`object`
-                value
-        """
-        if self._type is not None and type(__object) != self._type and not isinstance(type(__object), self._type) and not issubclass(type(__object), self._type):
-            raise Exception(f'Unexpected type: {type(__object)}\nExpected type: {self._type}')
-
-        if len(self) == 0 and self._type is None:
-            self._type = type(__object)
-
-        super().append(__object)
-
     @abstractmethod
-    def average(self, func: Callable = None) -> Union[int, float, complex]:
+    def average(self, _func: Callable = None) -> Union[int, float, complex]:
         r"""Returns average value of list
 
         Parameter
@@ -99,7 +65,7 @@ class IterableABC(ABC, list):
         pass
 
     @abstractmethod
-    def count(self, func: Callable = None) -> int:
+    def count(self, _func: Callable = None) -> int:
         r"""Returns length of list or count of found elements
 
         Parameter
@@ -114,7 +80,7 @@ class IterableABC(ABC, list):
         pass
 
     @abstractmethod
-    def distinct(self, func: Callable = None) -> 'IterableABC':
+    def distinct(self, _func: Callable = None) -> 'QueryableABC':
         r"""Returns list without redundancies
 
         Parameter
@@ -124,7 +90,7 @@ class IterableABC(ABC, list):
 
         Returns
         -------
-            :class: `cpl_query.extension.iterable_abc.IterableABC`
+            :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
         pass
 
@@ -158,18 +124,36 @@ class IterableABC(ABC, list):
         """
         pass
 
-    def extend(self, __iterable: Iterable) -> 'IterableABC':
+    @abstractmethod
-        r"""Adds elements of given list to list
+    def first(self) -> any:
+        r"""Returns first element
+
+        Returns
+        -------
+            First element of list: any
+        """
+        pass
+
+    @abstractmethod
+    def first_or_default(self) -> any:
+        r"""Returns first element or None
+
+        Returns
+        -------
+            First element of list: Optional[any]
+        """
+        pass
+
+    @abstractmethod
+    def for_each(self, _func: Callable = None):
+        r"""Runs given function for each element of list
 
         Parameter
         ---------
-            __iterable: :class: `cpl_query.extension.iterable.Iterable`
+            func: :class: `Callable`
-                index
+                function to call
         """
-        for value in __iterable:
+        pass
-            self.append(value)
-
-        return self
 
     @abstractmethod
     def last(self) -> any:
@@ -192,39 +176,8 @@ class IterableABC(ABC, list):
         pass
 
     @abstractmethod
-    def first(self) -> any:
+    def max(self, _func: Callable = None) -> Union[int, float, complex]:
-        r"""Returns first element
+        r"""Returns the highest value
-
-        Returns
-        -------
-            First element of list: any
-        """
-        pass
-
-    @abstractmethod
-    def first_or_default(self) -> any:
-        r"""Returns first element or None
-
-        Returns
-        -------
-            First element of list: Optional[any]
-        """
-        pass
-
-    @abstractmethod
-    def for_each(self, func: Callable):
-        r"""Runs given function for each element of list
-
-        Parameter
-        ---------
-            func: :class: `Callable`
-                function to call
-        """
-        pass
-
-    @abstractmethod
-    def max(self, func: Callable = None) -> Union[int, float, complex]:
-        r"""Returns highest value
 
         Parameter
         ---------
@@ -238,8 +191,18 @@ class IterableABC(ABC, list):
         pass
 
     @abstractmethod
-    def min(self, func: Callable = None) -> Union[int, float, complex]:
+    def median(self) -> Union[int, float]:
-        r"""Returns highest value
+        r"""Return the median value of data elements
+
+        Returns
+        -------
+            Union[int, float]
+        """
+        pass
+
+    @abstractmethod
+    def min(self, _func: Callable = None) -> Union[int, float, complex]:
+        r"""Returns the lowest value
 
         Parameter
         ---------
@@ -253,7 +216,7 @@ class IterableABC(ABC, list):
         pass
 
     @abstractmethod
-    def order_by(self, func: Callable) -> 'IterableABC':
+    def order_by(self, _func: Callable = None) -> 'QueryableABC':
         r"""Sorts elements by function in ascending order
 
         Parameter
@@ -263,12 +226,12 @@ class IterableABC(ABC, list):
 
         Returns
         -------
-            :class: `cpl_query.extension.iterable_abc.IterableABC`
+            :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
         pass
 
     @abstractmethod
-    def order_by_descending(self, func: Callable) -> 'IterableABC':
+    def order_by_descending(self, _func: Callable = None) -> 'QueryableABC':
         r"""Sorts elements by function in descending order
 
         Parameter
@@ -278,35 +241,37 @@ class IterableABC(ABC, list):
 
         Returns
         -------
-            :class: `cpl_query.extension.iterable_abc.IterableABC`
+            :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
         pass
 
     @abstractmethod
-    def reverse(self) -> 'IterableABC':
+    def reverse(self) -> 'QueryableABC':
         r"""Reverses list
 
         Returns
         -------
-            :class: `cpl_query.extension.iterable_abc.IterableABC`
+            :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
         pass
 
-    def select(self, _f: Callable) -> 'IterableABC':
+    @abstractmethod
+    def select(self, _f: Callable) -> 'QueryableABC':
         r"""Formats each element of list to a given format
 
         Returns
         -------
-            :class: `cpl_query.extension.iterable_abc.IterableABC`
+            :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
         pass
 
-    def select_many(self, _f: Callable) -> 'IterableABC':
+    @abstractmethod
+    def select_many(self, _f: Callable) -> 'QueryableABC':
         r"""Flattens resulting lists to one
 
         Returns
         -------
-            :class: `cpl_query.extension.iterable_abc.IterableABC`
+            :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
         pass
 
@@ -336,7 +301,7 @@ class IterableABC(ABC, list):
         pass
 
     @abstractmethod
-    def skip(self, index: int) -> 'IterableABC':
+    def skip(self, index: int) -> 'QueryableABC':
         r"""Skips all elements from index
 
         Parameter
@@ -346,12 +311,12 @@ class IterableABC(ABC, list):
 
         Returns
         -------
-            :class: `cpl_query.extension.iterable_abc.IterableABC`
+            :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
         pass
 
     @abstractmethod
-    def skip_last(self, index: int) -> 'IterableABC':
+    def skip_last(self, index: int) -> 'QueryableABC':
         r"""Skips all elements after index
 
         Parameter
@@ -361,12 +326,12 @@ class IterableABC(ABC, list):
 
         Returns
         -------
-            :class: `cpl_query.extension.iterable_abc.IterableABC`
+            :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
         pass
 
     @abstractmethod
-    def sum(self, func: Callable = None) -> Union[int, float, complex]:
+    def sum(self, _func: Callable = None) -> Union[int, float, complex]:
         r"""Sum of all values
 
         Parameter
@@ -381,7 +346,7 @@ class IterableABC(ABC, list):
         pass
 
     @abstractmethod
-    def take(self, index: int) -> 'IterableABC':
+    def take(self, index: int) -> 'QueryableABC':
         r"""Takes all elements from index
 
         Parameter
@@ -391,12 +356,12 @@ class IterableABC(ABC, list):
 
         Returns
         -------
-            :class: `cpl_query.extension.iterable_abc.IterableABC`
+            :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
         pass
 
     @abstractmethod
-    def take_last(self, index: int) -> 'IterableABC':
+    def take_last(self, index: int) -> 'QueryableABC':
         r"""Takes all elements after index
 
         Parameter
@@ -406,21 +371,12 @@ class IterableABC(ABC, list):
 
         Returns
         -------
-            :class: `cpl_query.extension.iterable_abc.IterableABC`
+            :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
         pass
 
-    def to_list(self) -> list:
-        r"""Converts :class: `cpl_query.extension.iterable_abc.IterableABC` to :class: `list`
-
-        Returns
-        -------
-            :class: `list`
-        """
-        return list(self)
-
     @abstractmethod
-    def where(self, func: Callable) -> 'IterableABC':
+    def where(self, _func: Callable = None) -> 'QueryableABC':
         r"""Select element by function
 
         Parameter
@@ -430,6 +386,6 @@ class IterableABC(ABC, list):
 
         Returns
         -------
-            :class: `cpl_query.extension.iterable_abc.IterableABC`
+            :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
         pass

src/cpl_query/base/sequence_values.py

@@ -0,0 +1,49 @@
+import io
+import itertools
+
+from cpl_query.exceptions import IndexOutOfRangeException
+
+
+class SequenceValues:
+    def __init__(self, data, _t: type):
+        if data is None:
+            data = []
+
+        if len(data) > 0:
+            def type_check(_t: type, _l: list):
+                return all(isinstance(x, _t) for x in _l)
+
+            if not type_check(_t, data):
+                raise Exception(f'Unexpected type\nExpected type: {_t}')
+
+        if not hasattr(data, '__iter__'):
+            raise TypeError(f'{type(self).__name__} must be instantiated with an iterable object')
+
+        self._new_cycle = lambda: itertools.cycle(data)
+        self._len = lambda: len(data)
+
+        self._index = 0
+        self._cycle = self._new_cycle()
+
+    def __len__(self):
+        return self._len()
+
+    def __iter__(self):
+        i = 0
+        while i < len(self):
+            yield next(self._cycle)
+            i += 1
+
+    def __next__(self):
+        if self._index >= len(self):
+            raise IndexOutOfRangeException()
+        self._index += 1
+
+        return self.next()
+
+    def next(self):
+        return next(self._cycle)
+
+    def reset(self):
+        self._index = 0
+        self._cycle = self._new_cycle()

src/cpl_query/cpl-query.json

@@ -4,7 +4,7 @@
     "Version": {
       "Major": "2022",
       "Minor": "10",
-      "Micro": "2"
+      "Micro": "9"
     },
     "Author": "Sven Heidemann",
     "AuthorEmail": "sven.heidemann@sh-edraft.de",

src/cpl_query/enumerable/__init__.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+
+"""
+cpl-query sh-edraft Common Python library Query
+~~~~~~~~~~~~~~~~~~~
+
+sh-edraft Common Python library Python integrated Queries
+
+:copyright: (c) 2021 - 2022 sh-edraft.de
+:license: MIT, see LICENSE for more details.
+
+"""
+
+__title__ = 'cpl_query.enumerable'
+__author__ = 'Sven Heidemann'
+__license__ = 'MIT'
+__copyright__ = 'Copyright (c) 2021 - 2022 sh-edraft.de'
+__version__ = '2022.10.9'
+
+from collections import namedtuple
+
+
+# imports:
+from .enumerable import Enumerable
+from .enumerable_abc import EnumerableABC
+from .ordered_enumerable import OrderedEnumerable
+from .ordered_enumerable_abc import OrderedEnumerableABC
+
+VersionInfo = namedtuple('VersionInfo', 'major minor micro')
+version_info = VersionInfo(major='2022', minor='10', micro='9')

src/cpl_query/enumerable/enumerable.py

@@ -0,0 +1,319 @@
+from typing import Union, Callable, Optional
+
+from cpl_query._helper import is_number
+from cpl_query.enumerable.enumerable_abc import EnumerableABC
+from cpl_query.enumerable.ordered_enumerable_abc import OrderedEnumerableABC
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument, InvalidTypeException, IndexOutOfRangeException
+
+
+def _default_lambda(x: object):
+    return x
+
+
+class Enumerable(EnumerableABC):
+    r"""Implementation of :class: `cpl_query.enumerable.enumerable_abc.EnumerableABC`
+    """
+
+    def __init__(self, t: type = None, values: Union[list, iter] = None):
+        EnumerableABC.__init__(self, t, values)
+
+    def all(self, _func: Callable = None) -> bool:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        result = self.where(_func)
+        return len(result) == len(self)
+
+    def any(self, _func: Callable = None) -> bool:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        result = self.where(_func)
+        return len(result) > 0
+
+    def average(self, _func: Callable = None) -> Union[int, float, complex]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None and not is_number(self.type):
+            raise InvalidTypeException()
+
+        if _func is None:
+            _func = _default_lambda
+
+        return float(self.sum(_func)) / float(self.count())
+
+    def contains(self, _value: object) -> bool:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _value is None:
+            raise ArgumentNoneException(ExceptionArgument.value)
+
+        return self.where(lambda x: x == _value).count() > 0
+
+    def count(self, _func: Callable = None) -> int:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            return len(self)
+
+        return len(self.where(_func))
+
+    def distinct(self, _func: Callable = None) -> EnumerableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        result = Enumerable()
+        known_values = []
+        for element in self:
+            value = _func(element)
+            if value in known_values:
+                continue
+
+            known_values.append(value)
+            result.add(element)
+
+        return result
+
+    def element_at(self, _index: int) -> any:
+        self._values.reset()
+        while _index >= 0:
+            current = self.next()
+            if _index == 0:
+                return current
+            _index -= 1
+
+    def element_at_or_default(self, _index: int) -> any:
+        try:
+            return self.element_at(_index)
+        except IndexOutOfRangeException:
+            return None
+
+    @staticmethod
+    def empty() -> 'EnumerableABC':
+        r"""Returns an empty enumerable
+
+        Returns
+        -------
+            Enumerable object that contains no elements
+        """
+        return Enumerable()
+
+    def first(self: EnumerableABC, _func=None) -> any:
+        if _func is not None:
+            return self.where(_func).element_at(0)
+        return self.element_at(0)
+
+    def first_or_default(self: EnumerableABC, _func=None) -> Optional[any]:
+        if _func is not None:
+            return self.where(_func).element_at_or_default(0)
+        return self.element_at_or_default(0)
+
+    def for_each(self, _func: Callable = None):
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        for element in self:
+            _func(element)
+
+    def last(self: EnumerableABC) -> any:
+        return self.element_at(self.count() - 1)
+
+    def last_or_default(self: EnumerableABC) -> Optional[any]:
+        return self.element_at_or_default(self.count() - 1)
+
+    def max(self, _func: Callable = None) -> Union[int, float, complex]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None and not is_number(self.type):
+            raise InvalidTypeException()
+
+        if _func is None:
+            _func = _default_lambda
+
+        return _func(max(self, key=_func))
+
+    def median(self, _func=None) -> Union[int, float]:
+        if _func is None:
+            _func = _default_lambda
+        result = self.order_by(_func).select(_func).to_list()
+        length = len(result)
+        i = int(length / 2)
+        return (
+            result[i]
+            if length % 2 == 1
+            else (float(result[i - 1]) + float(result[i])) / float(2)
+        )
+
+    def min(self, _func: Callable = None) -> Union[int, float, complex]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None and not is_number(self.type):
+            raise InvalidTypeException()
+
+        if _func is None:
+            _func = _default_lambda
+
+        return _func(min(self, key=_func))
+
+    def order_by(self, _func: Callable = None) -> OrderedEnumerableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        from cpl_query.enumerable.ordered_enumerable import OrderedEnumerable
+        return OrderedEnumerable(self.type, _func, sorted(self, key=_func))
+
+    def order_by_descending(self, _func: Callable = None) -> OrderedEnumerableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        from cpl_query.enumerable.ordered_enumerable import OrderedEnumerable
+        return OrderedEnumerable(self.type, _func, sorted(self, key=_func, reverse=True))
+
+    @staticmethod
+    def range(start: int, length: int) -> 'EnumerableABC':
+        return Enumerable(int, range(start, length))
+
+    def reverse(self: EnumerableABC) -> EnumerableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        return Enumerable(self.type, list(reversed(self.to_list())))
+
+    def select(self, _func: Callable = None) -> EnumerableABC:
+        if _func is None:
+            _func = _default_lambda
+
+        _l = [_func(_o) for _o in self]
+        return Enumerable(self._type if len(_l) < 1 else type(_l[0]), _l)
+
+    def select_many(self, _func: Callable = None) -> EnumerableABC:
+        if _func is None:
+            _func = _default_lambda
+
+        # The line below is pain. I don't understand anything of the list comprehension...
+        # written on 09.11.2022 by Sven Heidemann
+        _l = [_a for _o in self for _a in _func(_o)]
+        return Enumerable(self._type if len(_l) < 1 else type(_l[0]), _l)
+
+    def single(self: EnumerableABC) -> any:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if len(self) > 1:
+            raise IndexError('Found more than one element')
+        elif len(self) == 0:
+            raise IndexOutOfRangeException(f'{type(self).__name__} is empty')
+
+        return self.element_at(0)
+
+    def single_or_default(self: EnumerableABC) -> Optional[any]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if len(self) > 1:
+            raise IndexError('Found more than one element')
+        elif len(self) == 0:
+            return None
+
+        return self.element_at(0)
+
+    def skip(self, _index: int) -> EnumerableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _index is None:
+            raise ArgumentNoneException(ExceptionArgument.index)
+
+        _list = self.to_list()
+
+        if _index >= len(_list):
+            raise IndexOutOfRangeException()
+
+        return Enumerable(self.type, _list[_index:])
+
+    def skip_last(self, _index: int) -> EnumerableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _index is None:
+            raise ArgumentNoneException(ExceptionArgument.index)
+
+        index = len(self) - _index
+
+        if index >= len(self) or index < 0:
+            raise IndexOutOfRangeException()
+
+        return self.take(len(self) - _index)
+
+    def take(self, _index: int) -> EnumerableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _index is None:
+            raise ArgumentNoneException(ExceptionArgument.index)
+
+        _list = self.to_list()
+
+        if _index >= len(_list):
+            raise IndexOutOfRangeException()
+
+        return Enumerable(self.type, _list[:_index])
+
+    def take_last(self, _index: int) -> EnumerableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _index is None:
+            raise ArgumentNoneException(ExceptionArgument.index)
+
+        _list = self.to_list()
+        index = len(_list) - _index
+
+        if index >= len(_list) or index < 0:
+            raise IndexOutOfRangeException()
+
+        return self.skip(index)
+
+    def sum(self, _func: Callable = None) -> Union[int, float, complex]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None and not is_number(self.type):
+            raise InvalidTypeException()
+
+        if _func is None:
+            _func = _default_lambda
+
+        return sum([_func(x) for x in self])
+
+    def where(self, _func: Callable = None) -> EnumerableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            raise ArgumentNoneException(ExceptionArgument.func)
+
+        return Enumerable(self.type, list(filter(_func, self._values)))

src/cpl_query/enumerable/enumerable_abc.py

@@ -0,0 +1,106 @@
+from abc import abstractmethod
+from typing import Iterable
+
+from cpl_query.base.queryable_abc import QueryableABC
+from cpl_query.base.sequence_values import SequenceValues
+
+
+class EnumerableABC(QueryableABC):
+    r"""ABC to define functions on list
+    """
+
+    @abstractmethod
+    def __init__(self, t: type = None, values: list = None):
+        if t == any or t is None and values is not None:
+            t = type(values[0])
+
+        self._type, self._values, self._remove_error_check = t, SequenceValues(values, t), True
+
+    def __len__(self):
+        return len(self._values)
+
+    def __iter__(self):
+        return iter(self._values)
+
+    def next(self):
+        return next(self._values)
+
+    def __next__(self):
+        return self.next()
+
+    def __repr__(self):
+        return f'<{type(self).__name__} {list(self).__repr__()}>'
+
+    @property
+    def type(self) -> type:
+        return self._type
+
+    def set_remove_error_check(self, _value: bool):
+        r"""Set flag to check if element exists before removing
+        """
+        self._remove_error_check = _value
+
+    def add(self, __object: object) -> None:
+        r"""Adds an element to the enumerable.
+        """
+        if self._type is not None and type(__object) != self._type and not isinstance(type(__object), self._type) and not issubclass(type(__object), self._type):
+            raise Exception(f'Unexpected type: {type(__object)}\nExpected type: {self._type}')
+
+        if len(self) == 0 and self._type is None:
+            self._type = type(__object)
+
+        self._values = SequenceValues([*self._values, __object], self._type)
+
+    def clear(self):
+        r"""Removes all elements
+        """
+        del self._values
+        self._values = []
+
+    def extend(self, __list: Iterable) -> 'EnumerableABC':
+        r"""Adds elements of given list to enumerable
+
+        Parameter
+        ---------
+            __enumerable: :class: `cpl_query.enumerable.enumerable_abc.EnumerableABC`
+                index
+        """
+        self._values = SequenceValues([*self._values, *__list], self._type)
+        return self
+
+    def remove(self, __object: object) -> None:
+        r"""Removes element from list
+
+        Parameter
+        ---------
+            __object: :class:`object`
+                value
+
+        Raises
+        ---------
+            `Element not found` when element does not exist. Check can be deactivated by calling <enumerable>.set_remove_error_check(False)
+        """
+        if self._remove_error_check and __object not in self._values:
+            raise Exception('Element not found')
+
+        # self._values.remove(__object)
+        self._values = SequenceValues([x for x in self.to_list() if x != __object], self._type)
+
+    def to_iterable(self) -> 'IterableABC':
+        r"""Converts :class: `cpl_query.enumerable.enumerable_abc.EnumerableABC` to :class: `cpl_query.iterable.iterable_abc.IterableABC`
+
+        Returns
+        -------
+            :class: `cpl_query.iterable.iterable_abc.IterableABC`
+        """
+        from cpl_query.iterable.iterable import Iterable
+        return Iterable(self._type, self.to_list())
+
+    def to_list(self) -> list:
+        r"""Converts :class: `cpl_query.base.sequence_abc.SequenceABC` to :class: `list`
+
+        Returns
+        -------
+            :class: `list`
+        """
+        return [x for x in self]

src/cpl_query/enumerable/ordered_enumerable.py

@@ -0,0 +1,36 @@
+from collections.abc import Callable
+from typing import Iterable
+
+from cpl_query.enumerable.enumerable import Enumerable
+from cpl_query.enumerable.ordered_enumerable_abc import OrderedEnumerableABC
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
+
+
+class OrderedEnumerable(Enumerable, OrderedEnumerableABC):
+    r"""Implementation of :class: `cpl_query.extension.Enumerable` `cpl_query.extension.OrderedEnumerableABC`
+    """
+
+    def __init__(self, _t: type, _func: Callable = None, _values: Iterable = None):
+        Enumerable.__init__(self, _t)
+        OrderedEnumerableABC.__init__(self, _t, _func, _values)
+
+    def then_by(self: OrderedEnumerableABC, _func: Callable) -> OrderedEnumerableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            raise ArgumentNoneException(ExceptionArgument.func)
+
+        self._funcs.append(_func)
+
+        return OrderedEnumerable(self.type, _func, sorted(self, key=lambda *args: [f(*args) for f in self._funcs]))
+
+    def then_by_descending(self: OrderedEnumerableABC, _func: Callable) -> OrderedEnumerableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            raise ArgumentNoneException(ExceptionArgument.func)
+
+        self._funcs.append(_func)
+        return OrderedEnumerable(self.type, _func, sorted(self, key=lambda *args: [f(*args) for f in self._funcs], reverse=True))

src/cpl_query/enumerable/ordered_enumerable_abc.py

@@ -0,0 +1,43 @@
+from abc import abstractmethod
+from collections.abc import Callable
+from typing import Iterable
+
+from cpl_query.enumerable.enumerable_abc import EnumerableABC
+
+
+class OrderedEnumerableABC(EnumerableABC):
+
+    @abstractmethod
+    def __init__(self, _t: type, _func: Callable = None, _values: Iterable = None):
+        EnumerableABC.__init__(self, _t, _values)
+        self._funcs: list[Callable] = []
+        if _func is not None:
+            self._funcs.append(_func)
+
+    @abstractmethod
+    def then_by(self, func: Callable) -> 'OrderedEnumerableABC':
+        r"""Sorts OrderedList in ascending order by function
+
+        Parameter
+        ---------
+            func: :class:`Callable`
+            
+        Returns
+        -------
+            list of :class:`cpl_query.extension.OrderedEnumerableABC`
+        """
+        pass
+
+    @abstractmethod
+    def then_by_descending(self, func: Callable) -> 'OrderedEnumerableABC':
+        r"""Sorts OrderedList in descending order by function
+
+        Parameter
+        ---------
+            func: :class:`Callable`
+            
+        Returns
+        -------
+            list of :class:`cpl_query.extension.OrderedEnumerableABC`
+        """
+        pass

src/cpl_query/exceptions.py

@@ -23,8 +23,8 @@ class IndexOutOfRangeException(Exception):
     r"""Exception when index is out of range
     """
 
-    def __init__(self):
+    def __init__(self, err: str = None):
-        Exception.__init__(self, f'List index out of range')
+        Exception.__init__(self, f'List index out of range' if err is None else err)
 
 
 class InvalidTypeException(Exception):

src/cpl_query/extension/__init__.py

@@ -15,17 +15,13 @@ __title__ = 'cpl_query.extension'
 __author__ = 'Sven Heidemann'
 __license__ = 'MIT'
 __copyright__ = 'Copyright (c) 2021 - 2022 sh-edraft.de'
-__version__ = '2022.10.2'
+__version__ = '2022.10.9'
 
 from collections import namedtuple
 
 
 # imports:
-from .iterable_abc import IterableABC
-from .iterable import Iterable
 from .list import List
-from .ordered_iterable_abc import OrderedIterableABC
-from .ordered_iterable import OrderedIterable
 
 VersionInfo = namedtuple('VersionInfo', 'major minor micro')
-version_info = VersionInfo(major='2022', minor='10', micro='2')
+version_info = VersionInfo(major='2022', minor='10', micro='9')

src/cpl_query/extension/iterable.py

@@ -1,106 +0,0 @@
-from typing import Callable, Optional, Union
-
-from cpl_query.extension.iterable_abc import IterableABC
-from cpl_query.extension.ordered_iterable_abc import OrderedIterableABC
-from cpl_query.query import Query
-
-
-class Iterable(IterableABC):
-
-    def __init__(self, t: type = None, values: list = None):
-        IterableABC.__init__(self, t, values)
-
-    def any(self, func: Callable) -> bool:
-        return Query.any(self, func)
-
-    def all(self, func: Callable) -> bool:
-        return Query.all(self, func)
-
-    def average(self, func: Callable = None) -> Union[int, float, complex]:
-        return Query.avg(self, func)
-
-    def contains(self, value: object) -> bool:
-        return Query.contains(self, value)
-
-    def count(self, func: Callable = None) -> int:
-        return Query.count(self, func)
-
-    def distinct(self, func: Callable = None) -> IterableABC:
-        return self.__to_self(Query.distinct(self, func))
-
-    def element_at(self, index: int) -> any:
-        return Query.element_at(self, index)
-
-    def element_at_or_default(self, index: int) -> Optional[any]:
-        return Query.element_at_or_default(self, index)
-
-    def last(self) -> any:
-        return Query.last(self)
-
-    def last_or_default(self) -> Optional[any]:
-        return Query.last_or_default(self)
-
-    def first(self) -> any:
-        return Query.first(self)
-
-    def first_or_default(self) -> Optional[any]:
-        return Query.first_or_default(self)
-
-    def for_each(self, func: Callable):
-        Query.for_each(self, func)
-
-    def max(self, func: Callable = None) -> Union[int, float, complex]:
-        return Query.max(self, func)
-
-    def min(self, func: Callable = None) -> Union[int, float, complex]:
-        return Query.min(self, func)
-
-    def order_by(self, func: Callable) -> OrderedIterableABC:
-        res = Query.order_by(self, func)
-        from cpl_query.extension.ordered_iterable import OrderedIterable
-        res.__class__ = OrderedIterable
-        return res
-
-    def order_by_descending(self, func: Callable) -> OrderedIterableABC:
-        res = Query.order_by_descending(self, func)
-        from cpl_query.extension.ordered_iterable import OrderedIterable
-        res.__class__ = OrderedIterable
-        return res
-
-    def reverse(self) -> IterableABC:
-        return Query.reverse(self)
-
-    def single(self) -> any:
-        return Query.single(self)
-
-    def single_or_default(self) -> Optional[any]:
-        return Query.single_or_default(self)
-
-    def select(self, _f: Callable) -> IterableABC:
-        return self.__to_self(Query.select(self, _f))
-
-    def select_many(self, _f: Callable) -> IterableABC:
-        return self.__to_self(Query.select_many(self, _f))
-
-    def skip(self, index: int) -> IterableABC:
-        return self.__to_self(Query.skip(self, index))
-
-    def skip_last(self, index: int) -> IterableABC:
-        return self.__to_self(Query.skip_last(self, index))
-
-    def sum(self, func: Callable = None) -> Union[int, float, complex]:
-        return Query.sum(self, func)
-
-    def take(self, index: int) -> IterableABC:
-        return self.__to_self(Query.take(self, index))
-
-    def take_last(self, index: int) -> IterableABC:
-        return self.__to_self(Query.take_last(self, index))
-
-    def where(self, func: Callable) -> IterableABC:
-        return self.__to_self(Query.where(self, func))
-
-    @staticmethod
-    def __to_self(obj: IterableABC) -> IterableABC:
-        obj.__class__ = Iterable
-        return obj

src/cpl_query/extension/list.py

@@ -1,9 +1,31 @@
-from cpl_query.extension.iterable import Iterable
+from typing import Iterable as IterableType
+
+from cpl_query.iterable.iterable import Iterable
 
 
 class List(Iterable):
     r"""Implementation of :class: `cpl_query.extension.iterable.Iterable`
     """
 
-    def __init__(self, t: type = None, values: list = None):
+    def __init__(self, t: type = None, values: IterableType = None):
         Iterable.__init__(self, t, values)
+
+    def to_enumerable(self) -> 'EnumerableABC':
+        r"""Converts :class: `cpl_query.iterable.iterable_abc.IterableABC` to :class: `cpl_query.enumerable.enumerable_abc.EnumerableABC`
+
+        Returns
+        -------
+            :class: `cpl_query.enumerable.enumerable_abc.EnumerableABC`
+        """
+        from cpl_query.enumerable.enumerable import Enumerable
+        return Enumerable(self._type, self.to_list())
+
+    def to_iterable(self) -> 'IterableABC':
+        r"""Converts :class: `cpl_query.enumerable.enumerable_abc.EnumerableABC` to :class: `cpl_query.iterable.iterable_abc.IterableABC`
+
+        Returns
+        -------
+            :class: `cpl_query.iterable.iterable_abc.IterableABC`
+        """
+        from cpl_query.iterable.iterable import Iterable
+        return Iterable(self._type, self.to_list())

src/cpl_query/extension/ordered_iterable.py

@@ -1,22 +0,0 @@
-from collections.abc import Callable
-
-from cpl_query.extension.iterable import Iterable
-from cpl_query.extension.ordered_iterable_abc import OrderedIterableABC
-from cpl_query.query import Query
-
-
-class OrderedIterable(Iterable, OrderedIterableABC):
-    r"""Implementation of :class: `cpl_query.extension.Iterable` `cpl_query.extension.OrderedIterableABC`
-    """
-
-    def __init__(self, _t: type = None):
-        Iterable.__init__(self, _t)
-        OrderedIterableABC.__init__(self, _t)
-
-    def then_by(self, _func: Callable) -> OrderedIterableABC:
-        self._funcs.append(_func)
-        return Query.then_by(self, lambda *args: [f(*args) for f in self._funcs])
-
-    def then_by_descending(self, _func: Callable) -> OrderedIterableABC:
-        self._funcs.append(_func)
-        return Query.then_by_descending(self, lambda *args: [f(*args) for f in self._funcs])

src/cpl_query/iterable/__init__.py

@@ -0,0 +1,30 @@
+# -*- coding: utf-8 -*-
+
+"""
+cpl-query sh-edraft Common Python library Query
+~~~~~~~~~~~~~~~~~~~
+
+sh-edraft Common Python library Python integrated Queries
+
+:copyright: (c) 2021 - 2022 sh-edraft.de
+:license: MIT, see LICENSE for more details.
+
+"""
+
+__title__ = 'cpl_query.iterable'
+__author__ = 'Sven Heidemann'
+__license__ = 'MIT'
+__copyright__ = 'Copyright (c) 2021 - 2022 sh-edraft.de'
+__version__ = '2022.10.9'
+
+from collections import namedtuple
+
+
+# imports:
+from .iterable_abc import IterableABC
+from .iterable import Iterable
+from .ordered_iterable_abc import OrderedIterableABC
+from .ordered_iterable import OrderedIterable
+
+VersionInfo = namedtuple('VersionInfo', 'major minor micro')
+version_info = VersionInfo(major='2022', minor='10', micro='9')

src/cpl_query/iterable/iterable.py

@@ -0,0 +1,343 @@
+from typing import Callable, Optional, Union, Iterable as IterableType
+
+from cpl_query._helper import is_number
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument, InvalidTypeException, IndexOutOfRangeException
+from cpl_query.iterable.iterable_abc import IterableABC
+from cpl_query.iterable.ordered_iterable_abc import OrderedIterableABC
+
+
+def _default_lambda(x: object):
+    return x
+
+
+class Iterable(IterableABC):
+
+    def __init__(self, t: type = None, values: IterableType = None):
+        IterableABC.__init__(self, t, values)
+
+    def all(self, _func: Callable = None) -> bool:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        result = self.where(_func)
+        return len(result) == len(self)
+
+    def any(self, _func: Callable = None) -> bool:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        result = self.where(_func)
+        return len(result) > 0
+
+    def average(self, _func: Callable = None) -> Union[int, float, complex]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None and not is_number(self.type):
+            raise InvalidTypeException()
+
+        if _func is None:
+            _func = _default_lambda
+
+        return float(self.sum(_func)) / float(self.count())
+
+    def contains(self, _value: object) -> bool:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _value is None:
+            raise ArgumentNoneException(ExceptionArgument.value)
+
+        return self.where(lambda x: x == _value).count() > 0
+
+    def count(self, _func: Callable = None) -> int:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            return len(self)
+
+        return len(self.where(_func))
+
+    def distinct(self, _func: Callable = None) -> IterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        result = Iterable()
+        known_values = []
+        for element in self:
+            value = _func(element)
+            if value in known_values:
+                continue
+
+            known_values.append(value)
+            result.append(element)
+
+        return result
+
+    def element_at(self, _index: int) -> any:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _index is None:
+            raise ArgumentNoneException(ExceptionArgument.index)
+
+        return self[_index]
+
+    def element_at_or_default(self, _index: int) -> any:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _index is None:
+            raise ArgumentNoneException(ExceptionArgument.index)
+
+        try:
+            return self[_index]
+        except IndexError:
+            return None
+
+    def first(self: IterableABC) -> any:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if len(self) == 0:
+            raise IndexOutOfRangeException()
+
+        return self[0]
+
+    def first_or_default(self: IterableABC) -> Optional[any]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if len(self) == 0:
+            return None
+
+        return self[0]
+
+    def last(self: IterableABC) -> any:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if len(self) == 0:
+            raise IndexOutOfRangeException()
+
+        return self[len(self) - 1]
+
+    def last_or_default(self: IterableABC) -> Optional[any]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if len(self) == 0:
+            return None
+
+        return self[len(self) - 1]
+
+    def for_each(self, _func: Callable = None):
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        for element in self:
+            _func(element)
+
+    def max(self, _func: Callable = None) -> Union[int, float, complex]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None and not is_number(self.type):
+            raise InvalidTypeException()
+
+        if _func is None:
+            _func = _default_lambda
+
+        return _func(max(self, key=_func))
+
+    def median(self, _func=None) -> Union[int, float]:
+        if _func is None:
+            _func = _default_lambda
+        result = self.order_by(_func).select(_func).to_list()
+        length = len(result)
+        i = int(length / 2)
+        return (
+            result[i]
+            if length % 2 == 1
+            else (float(result[i - 1]) + float(result[i])) / float(2)
+        )
+
+    def min(self, _func: Callable = None) -> Union[int, float, complex]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None and not is_number(self.type):
+            raise InvalidTypeException()
+
+        if _func is None:
+            _func = _default_lambda
+
+        return _func(min(self, key=_func))
+
+    def order_by(self, _func: Callable = None) -> OrderedIterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        from cpl_query.iterable.ordered_iterable import OrderedIterable
+        return OrderedIterable(self.type, _func, sorted(self, key=_func))
+
+    def order_by_descending(self, _func: Callable = None) -> OrderedIterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            _func = _default_lambda
+
+        from cpl_query.iterable.ordered_iterable import OrderedIterable
+        return OrderedIterable(self.type, _func, sorted(self, key=_func, reverse=True))
+
+    def reverse(self: IterableABC) -> IterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        return Iterable().extend(reversed(self.to_list()))
+
+    def select(self, _func: Callable = None) -> IterableABC:
+        if _func is None:
+            _func = _default_lambda
+
+        result = Iterable()
+        result.extend(_func(_o) for _o in self)
+        return result
+
+    def select_many(self, _func: Callable = None) -> IterableABC:
+        if _func is None:
+            _func = _default_lambda
+
+        result = Iterable()
+        # The line below is pain. I don't understand anything of it...
+        # written on 09.11.2022 by Sven Heidemann
+        elements = [_a for _o in self for _a in _func(_o)]
+
+        result.extend(elements)
+        return result
+
+    def single(self: IterableABC) -> any:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if len(self) > 1:
+            raise Exception('Found more than one element')
+        elif len(self) == 0:
+            raise Exception('Found no element')
+
+        return self[0]
+
+    def single_or_default(self: IterableABC) -> Optional[any]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if len(self) > 1:
+            raise Exception('Index out of range')
+        elif len(self) == 0:
+            return None
+
+        return self[0]
+
+    def skip(self, _index: int) -> IterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _index is None:
+            raise ArgumentNoneException(ExceptionArgument.index)
+
+        if _index >= len(self):
+            raise IndexOutOfRangeException()
+
+        return Iterable(self.type, values=self[_index:])
+
+    def skip_last(self, _index: int) -> IterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _index is None:
+            raise ArgumentNoneException(ExceptionArgument.index)
+
+        index = len(self) - _index
+
+        if index >= len(self) or index < 0:
+            raise IndexOutOfRangeException()
+
+        result = Iterable()
+        result.extend(self[:index])
+        return result
+
+    def take(self, _index: int) -> IterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _index is None:
+            raise ArgumentNoneException(ExceptionArgument.index)
+
+        if _index >= len(self):
+            raise IndexOutOfRangeException()
+
+        result = Iterable()
+        result.extend(self[:_index])
+        return result
+
+    def take_last(self, _index: int) -> IterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _index is None:
+            raise ArgumentNoneException(ExceptionArgument.index)
+
+        index = len(self) - _index
+
+        if index >= len(self) or index < 0:
+            raise IndexOutOfRangeException()
+
+        result = Iterable()
+        result.extend(self[index:])
+        return result
+
+    def sum(self, _func: Callable = None) -> Union[int, float, complex]:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None and not is_number(self.type):
+            raise InvalidTypeException()
+
+        if _func is None:
+            _func = _default_lambda
+
+        return sum([_func(x) for x in self])
+
+    def where(self, _func: Callable = None) -> IterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            raise ArgumentNoneException(ExceptionArgument.func)
+
+        if _func is None:
+            _func = _default_lambda
+
+        result = Iterable(self.type)
+        for element in self:
+            if _func(element):
+                result.append(element)
+
+        return result

src/cpl_query/iterable/iterable_abc.py

@@ -0,0 +1,71 @@
+from abc import abstractmethod
+from typing import Iterable
+
+from cpl_query.base.queryable_abc import QueryableABC
+
+
+class IterableABC(list, QueryableABC):
+    r"""ABC to define functions on list
+    """
+
+    @abstractmethod
+    def __init__(self, t: type = None, values: Iterable = None):
+        self._type = t
+        list.__init__(self, [] if values is None else values)
+
+    def __repr__(self):
+        return f'<{type(self).__name__} {list(self).__repr__()}>'
+
+    @property
+    def type(self) -> type:
+        return self._type
+
+    def to_list(self) -> list:
+        r"""Converts :class: `cpl_query.base.sequence_abc.SequenceABC` to :class: `list`
+
+        Returns
+        -------
+            :class: `list`
+        """
+        return [x for x in self]
+
+    def __str__(self):
+        return str(self.to_list())
+
+    def append(self, __object: object) -> None:
+        r"""Adds element to list
+        Parameter
+        ---------
+            __object: :class:`object`
+                value
+        """
+        if self._type is not None and type(__object) != self._type and not isinstance(type(__object), self._type) and not issubclass(type(__object), self._type):
+            raise Exception(f'Unexpected type: {type(__object)}\nExpected type: {self._type}')
+
+        if len(self) == 0 and self._type is None:
+            self._type = type(__object)
+
+        # self._values = SequenceValues([*self._values, __object], self._type)
+        super().append(__object)
+
+    def extend(self, __iterable: Iterable) -> 'IterableABC':
+        r"""Adds elements of given list to list
+        Parameter
+        ---------
+            __iterable: :class: `cpl_query.extension.iterable.Iterable`
+                index
+        """
+        for value in __iterable:
+            self.append(value)
+
+        return self
+
+    def to_enumerable(self) -> 'EnumerableABC':
+        r"""Converts :class: `cpl_query.iterable.iterable_abc.IterableABC` to :class: `cpl_query.enumerable.enumerable_abc.EnumerableABC`
+
+        Returns
+        -------
+            :class: `cpl_query.enumerable.enumerable_abc.EnumerableABC`
+        """
+        from cpl_query.enumerable.enumerable import Enumerable
+        return Enumerable(self._type, self.to_list())

src/cpl_query/iterable/ordered_iterable.py

@@ -0,0 +1,35 @@
+from collections.abc import Callable
+
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
+from cpl_query.iterable.iterable import Iterable
+from cpl_query.iterable.ordered_iterable_abc import OrderedIterableABC
+
+
+class OrderedIterable(Iterable, OrderedIterableABC):
+    r"""Implementation of :class: `cpl_query.extension.Iterable` `cpl_query.extension.OrderedIterableABC`
+    """
+
+    def __init__(self, _t: type, _func: Callable = None, _values: Iterable = None):
+        Iterable.__init__(self, _t)
+        OrderedIterableABC.__init__(self, _t, _func, _values)
+
+    def then_by(self: OrderedIterableABC, _func: Callable) -> OrderedIterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            raise ArgumentNoneException(ExceptionArgument.func)
+
+        self._funcs.append(_func)
+
+        return OrderedIterable(self.type, _func, sorted(self, key=lambda *args: [f(*args) for f in self._funcs]))
+
+    def then_by_descending(self: OrderedIterableABC, _func: Callable) -> OrderedIterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        if _func is None:
+            raise ArgumentNoneException(ExceptionArgument.func)
+
+        self._funcs.append(_func)
+        return OrderedIterable(self.type, _func, sorted(self, key=lambda *args: [f(*args) for f in self._funcs], reverse=True))

src/cpl_query/iterable/ordered_iterable_abc.py

@@ -1,14 +1,15 @@
 from abc import abstractmethod
 from collections.abc import Callable
+from typing import Iterable
 
-from cpl_query.extension.iterable_abc import IterableABC
+from cpl_query.iterable.iterable_abc import IterableABC
 
 
 class OrderedIterableABC(IterableABC):
 
     @abstractmethod
-    def __init__(self, _t: type, _func: Callable = None):
+    def __init__(self, _t: type, _func: Callable = None, _values: Iterable = None):
-        IterableABC.__init__(self, _t)
+        IterableABC.__init__(self, _t, _values)
         self._funcs: list[Callable] = []
         if _func is not None:
             self._funcs.append(_func)
@@ -23,7 +24,7 @@ class OrderedIterableABC(IterableABC):
             
         Returns
         -------
-            list of :class:`cpl_query.extension.OrderedIterableABC`
+            list of :class:`cpl_query.iterable.ordered_iterable_abc.OrderedIterableABC`
         """
         pass
 
@@ -37,6 +38,6 @@ class OrderedIterableABC(IterableABC):
             
         Returns
         -------
-            list of :class:`cpl_query.extension.OrderedIterableABC`
+            list of :class:`cpl_query.iterable.ordered_iterable_abc.OrderedIterableABC`
         """
         pass

src/cpl_query/query.py

@@ -1,405 +0,0 @@
-from typing import Callable, Union, Optional
-
-from cpl_query._helper import is_number
-from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument, InvalidTypeException, IndexOutOfRangeException
-from cpl_query.extension.iterable_abc import IterableABC
-from cpl_query.extension.ordered_iterable_abc import OrderedIterableABC
-
-
-class Query:
-
-    @staticmethod
-    def all(_list: IterableABC, _func: Callable) -> bool:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None:
-            raise ArgumentNoneException(ExceptionArgument.func)
-
-        result = Query.where(_list, _func)
-        return len(result) == len(_list)
-
-    @staticmethod
-    def any(_list: IterableABC, _func: Callable) -> bool:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None:
-            raise ArgumentNoneException(ExceptionArgument.func)
-
-        result = Query.where(_list, _func)
-        return len(result) > 0
-
-    @staticmethod
-    def avg(_list: IterableABC, _func: Callable) -> Union[int, float, complex]:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None and not is_number(_list.type):
-            raise InvalidTypeException()
-
-        average = 0
-        count = len(_list)
-
-        for element in _list:
-            if _func is not None:
-                value = _func(element)
-
-            else:
-                value = element
-
-            average += value
-
-        return average / count
-
-    @staticmethod
-    def contains(_list: IterableABC, _value: object) -> bool:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _value is None:
-            raise ArgumentNoneException(ExceptionArgument.value)
-
-        return _value in _list
-
-    @staticmethod
-    def count(_list: IterableABC, _func: Callable = None) -> int:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None:
-            return len(_list)
-
-        return len(Query.where(_list, _func))
-
-    @staticmethod
-    def distinct(_list: IterableABC, _func: Callable) -> IterableABC:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None:
-            raise ArgumentNoneException(ExceptionArgument.func)
-
-        result = IterableABC()
-        known_values = []
-        for element in _list:
-            value = _func(element)
-            if value in known_values:
-                continue
-
-            known_values.append(value)
-            result.append(element)
-
-        return result
-
-    @staticmethod
-    def element_at(_list: IterableABC, _index: int) -> any:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _index is None:
-            raise ArgumentNoneException(ExceptionArgument.index)
-
-        return _list[_index]
-
-    @staticmethod
-    def element_at_or_default(_list: IterableABC, _index: int) -> any:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _index is None:
-            raise ArgumentNoneException(ExceptionArgument.index)
-
-        try:
-            return _list[_index]
-        except IndexError:
-            return None
-
-    @staticmethod
-    def first(_list: IterableABC) -> any:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if len(_list) == 0:
-            raise IndexOutOfRangeException()
-
-        return _list[0]
-
-    @staticmethod
-    def first_or_default(_list: IterableABC) -> Optional[any]:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if len(_list) == 0:
-            return None
-
-        return _list[0]
-
-    @staticmethod
-    def last(_list: IterableABC) -> any:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if len(_list) == 0:
-            raise IndexOutOfRangeException()
-
-        return _list[len(_list) - 1]
-
-    @staticmethod
-    def last_or_default(_list: IterableABC) -> Optional[any]:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if len(_list) == 0:
-            return None
-
-        return _list[len(_list) - 1]
-
-    @staticmethod
-    def for_each(_list: IterableABC, _func: Callable):
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None:
-            raise ArgumentNoneException(ExceptionArgument.func)
-
-        for element in _list:
-            _func(element)
-
-    @staticmethod
-    def max(_list: IterableABC, _func: Callable) -> Union[int, float, complex]:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None and not is_number(_list.type):
-            raise InvalidTypeException()
-
-        max_value = 0
-        for element in _list:
-            if _func is not None:
-                value = _func(element)
-            else:
-                value = element
-
-            if value > max_value:
-                max_value = value
-
-        return max_value
-
-    @staticmethod
-    def min(_list: IterableABC, _func: Callable) -> Union[int, float, complex]:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None and not is_number(_list.type):
-            raise InvalidTypeException()
-
-        min_value = 0
-        is_first = True
-        for element in _list:
-            if _func is not None:
-                value = _func(element)
-            else:
-                value = element
-
-            if is_first:
-                min_value = value
-                is_first = False
-
-            if value < min_value:
-                min_value = value
-
-        return min_value
-
-    @staticmethod
-    def order_by(_list: IterableABC, _func: Callable) -> OrderedIterableABC:
-        result = OrderedIterableABC(_list.type, _func)
-        _list.sort(key=_func)
-        result.extend(_list)
-        return result
-
-    @staticmethod
-    def order_by_descending(_list: IterableABC, _func: Callable) -> OrderedIterableABC:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None:
-            raise ArgumentNoneException(ExceptionArgument.func)
-
-        result = OrderedIterableABC(_list.type, _func)
-        _list.sort(key=_func, reverse=True)
-        result.extend(_list)
-        return result
-
-    @staticmethod
-    def then_by(_list: OrderedIterableABC, _func: Callable) -> OrderedIterableABC:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None:
-            raise ArgumentNoneException(ExceptionArgument.func)
-
-        _list.sort(key=_func)
-        return _list
-
-    @staticmethod
-    def then_by_descending(_list: OrderedIterableABC, _func: Callable) -> OrderedIterableABC:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None:
-            raise ArgumentNoneException(ExceptionArgument.func)
-
-        _list.sort(key=_func, reverse=True)
-        return _list
-
-    @staticmethod
-    def reverse(_list: IterableABC) -> IterableABC:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        result = IterableABC()
-        _copied_list = _list.to_list()
-        _copied_list.reverse()
-        for element in _copied_list:
-            result.append(element)
-
-        return result
-
-    @staticmethod
-    def select(_list: IterableABC, _f: Callable) -> any:
-        result = IterableABC()
-        result.extend(_f(_o) for _o in _list)
-        return result
-
-    @staticmethod
-    def select_many(_list: IterableABC, _f: Callable) -> any:
-        result = IterableABC()
-        # The line below is pain. I don't understand anything of it...
-        # written on 09.11.2022 by Sven Heidemann
-        elements = [_a for _o in _list for _a in _f(_o)]
-
-        result.extend(elements)
-        return result
-
-    @staticmethod
-    def single(_list: IterableABC) -> any:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if len(_list) > 1:
-            raise Exception('Found more than one element')
-        elif len(_list) == 0:
-            raise Exception('Found no element')
-
-        return _list[0]
-
-    @staticmethod
-    def single_or_default(_list: IterableABC) -> Optional[any]:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if len(_list) > 1:
-            raise Exception('Index out of range')
-        elif len(_list) == 0:
-            return None
-
-        return _list[0]
-
-    @staticmethod
-    def skip(_list: IterableABC, _index: int) -> IterableABC:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _index is None:
-            raise ArgumentNoneException(ExceptionArgument.index)
-
-        if _index >= len(_list):
-            raise IndexOutOfRangeException()
-
-        result = IterableABC()
-        result.extend(_list[_index:])
-        return result
-
-    @staticmethod
-    def skip_last(_list: IterableABC, _index: int) -> IterableABC:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _index is None:
-            raise ArgumentNoneException(ExceptionArgument.index)
-
-        index = len(_list) - _index
-
-        if index >= len(_list) or index < 0:
-            raise IndexOutOfRangeException()
-
-        result = IterableABC()
-        result.extend(_list[:index])
-        return result
-
-    @staticmethod
-    def take(_list: IterableABC, _index: int) -> IterableABC:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _index is None:
-            raise ArgumentNoneException(ExceptionArgument.index)
-
-        if _index >= len(_list):
-            raise IndexOutOfRangeException()
-
-        result = IterableABC()
-        result.extend(_list[:_index])
-        return result
-
-    @staticmethod
-    def take_last(_list: IterableABC, _index: int) -> IterableABC:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _index is None:
-            raise ArgumentNoneException(ExceptionArgument.index)
-
-        index = len(_list) - _index
-
-        if index >= len(_list) or index < 0:
-            raise IndexOutOfRangeException()
-
-        result = IterableABC()
-        result.extend(_list[index:])
-        return result
-
-    @staticmethod
-    def sum(_list: IterableABC, _func: Callable) -> Union[int, float, complex]:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None and not is_number(_list.type):
-            raise InvalidTypeException()
-
-        result = 0
-        for element in _list:
-            if _func is not None:
-                value = _func(element)
-            else:
-                value = element
-
-            result += value
-
-        return result
-
-    @staticmethod
-    def where(_list: IterableABC, _func: Callable) -> IterableABC:
-        if _list is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None:
-            raise ArgumentNoneException(ExceptionArgument.func)
-
-        result = IterableABC(_list.type)
-        for element in _list:
-            if _func(element):
-                result.append(element)
-
-        return result

unittests/unittests_query/enumerable_query_test_case.py

@@ -0,0 +1,359 @@
+import string
+import unittest
+from random import randint
+
+from cpl_core.utils import String
+from cpl_query.enumerable.enumerable import Enumerable
+from cpl_query.exceptions import InvalidTypeException, ArgumentNoneException, IndexOutOfRangeException
+from unittests_query.models import User, Address
+
+
+class EnumerableQueryTestCase(unittest.TestCase):
+
+    def setUp(self) -> None:
+        self._tests = Enumerable(User)
+        self._t_user = User(
+            'Test user',
+            Address(
+                'teststr.',
+                15
+            )
+        )
+        self._t_user2 = User(
+            'Test user',
+            Address(
+                'teststr.',
+                14
+            )
+        )
+
+        self._generate_test_data()
+
+    def _generate_test_data(self):
+        for i in range(0, 100):
+            user = User(
+                String.random_string(string.ascii_letters, 8).lower(),
+                Address(
+                    String.random_string(string.ascii_letters, 10).lower(),
+                    randint(1, 10)
+                )
+            )
+
+            self._tests.add(user)
+
+        self._tests.add(self._t_user)
+        self._tests.add(self._t_user2)
+
+    def test_any(self):
+        results = []
+        for user in self._tests:
+            if user.address.nr == 10:
+                results.append(user)
+
+        res = self._tests.any(lambda u: u.address.nr == 10)
+        n_res = self._tests.any(lambda u: u.address.nr == 100)
+
+        self.assertTrue(res)
+        self.assertFalse(n_res)
+
+    def test_all(self):
+        results = []
+        for user in self._tests:
+            if user.address.nr == 10:
+                results.append(user)
+
+        res = self._tests.all(lambda u: u.address is not None)
+        n_res = self._tests.all(lambda u: u.address.nr == 100)
+
+        self.assertTrue(res)
+        self.assertFalse(n_res)
+
+    def test_avg(self):
+        avg = 0
+        for user in self._tests:
+            avg += user.address.nr
+
+        avg = avg / len(self._tests)
+        res = self._tests.average(lambda u: u.address.nr)
+
+        self.assertEqual(avg, res)
+
+        def invalid():
+            tests = Enumerable(str, ['hello', 'world'])
+            e_res = tests.average()
+
+        self.assertRaises(InvalidTypeException, invalid)
+
+        tests = Enumerable(int, list(range(0, 100)))
+        self.assertEqual(sum(tests) / len(tests), tests.average())
+
+        def wrong2():
+            tests2 = Enumerable(int, values=list(range(0, 100)))
+            e_res = tests2.average(lambda u: u.address.nr)
+
+        self.assertRaises(AttributeError, wrong2)
+
+    def test_contains(self):
+        self.assertTrue(self._tests.contains(self._t_user))
+        self.assertFalse(self._tests.contains(User("Test", None)))
+
+    def test_count(self):
+        self.assertEqual(len(self._tests), self._tests.count())
+        self.assertEqual(1, self._tests.count(lambda u: u == self._t_user))
+
+    def test_distinct(self):
+        res = self._tests.distinct(lambda u: u.address.nr).where(lambda u: u.address.nr == 5)
+        self.assertEqual(1, len(res))
+
+    def test_element_at(self):
+        index = randint(0, len(self._tests) - 1)
+        self.assertEqual(self._tests.element_at(index), self._tests.element_at(index))
+
+        def invalid():
+            result = self._tests.element_at(len(self._tests))
+
+        self.assertRaises(IndexOutOfRangeException, invalid)
+
+    def test_element_at_or_default(self):
+        index = randint(0, len(self._tests) - 1)
+        self.assertEqual(self._tests.element_at(index), self._tests.element_at_or_default(index))
+        self.assertIsNone(self._tests.element_at_or_default(len(self._tests)))
+
+    def test_last(self):
+        results = []
+        for user in self._tests:
+            if user.address.nr == 10:
+                results.append(user)
+
+        res = self._tests.where(lambda u: u.address.nr == 10)
+        s_res = self._tests.where(lambda u: u.address.nr == 10).last()
+
+        self.assertEqual(len(res), len(results))
+        self.assertEqual(res.element_at(len(res) - 1), s_res)
+
+    def test_last_or_default(self):
+        results = []
+        for user in self._tests:
+            if user.address.nr == 10:
+                results.append(user)
+
+        res = self._tests.where(lambda u: u.address.nr == 10)
+        s_res = self._tests.where(lambda u: u.address.nr == 10).last_or_default()
+        sn_res = self._tests.where(lambda u: u.address.nr == 11).last_or_default()
+
+        self.assertEqual(len(res), len(results))
+        self.assertEqual(res.element_at(len(res) - 1), s_res)
+        self.assertIsNone(sn_res)
+
+    def test_first(self):
+        results = []
+        for user in self._tests:
+            if user.address.nr == 10:
+                results.append(user)
+
+        res = self._tests.where(lambda u: u.address.nr == 10)
+        s_res = self._tests.where(lambda u: u.address.nr == 10).first()
+
+        self.assertEqual(len(res), len(results))
+        self.assertEqual(res.element_at(0), s_res)
+        self.assertEqual(res.element_at(0), res.first())
+        self.assertEqual(res.first(), res.first())
+
+    def test_first_or_default(self):
+        results = []
+        for user in self._tests:
+            if user.address.nr == 10:
+                results.append(user)
+
+        res = self._tests.where(lambda u: u.address.nr == 10)
+        s_res = self._tests.where(lambda u: u.address.nr == 10).first_or_default()
+        sn_res = self._tests.where(lambda u: u.address.nr == 11).first_or_default()
+
+        self.assertEqual(len(res), len(results))
+        self.assertEqual(res.element_at(0), s_res)
+        self.assertIsNone(sn_res)
+
+    def test_for_each(self):
+        users = []
+        self._tests.for_each(lambda user: (
+            users.append(user)
+        )
+                             )
+
+        self.assertEqual(len(users), len(self._tests))
+
+    def test_max(self):
+        res = self._tests.max(lambda u: u.address.nr)
+        self.assertEqual(res, self._t_user.address.nr)
+
+        tests = Enumerable(values=list(range(0, 100)))
+        self.assertEqual(99, tests.max())
+
+        def invalid():
+            tests = Enumerable(str, ['hello', 'world'])
+            e_res = tests.average()
+
+        self.assertRaises(InvalidTypeException, invalid)
+
+    def test_min(self):
+        res = self._tests.min(lambda u: u.address.nr)
+        self.assertEqual(1, res)
+
+        tests = Enumerable(values=list(range(0, 100)))
+        self.assertEqual(0, tests.min())
+
+        def invalid():
+            tests = Enumerable(str, ['hello', 'world'])
+            e_res = tests.average()
+
+        self.assertRaises(InvalidTypeException, invalid)
+
+    def test_order_by(self):
+        res = self._tests.order_by(lambda user: user.address.street)
+        res2 = self._tests.order_by(lambda user: user.address.nr).to_list()
+        s_res = self._tests.to_list()
+        s_res.sort(key=lambda user: user.address.street)
+        self.assertEqual(res.to_list(), s_res)
+
+        s_res = self._tests.to_list()
+        s_res.sort(key=lambda user: user.address.nr)
+        self.assertEqual(res2, s_res)
+
+        self.assertEqual(self._t_user, res.where(lambda u: u.address.nr == self._t_user.address.nr).single())
+
+    def test_order_by_descending(self):
+        res = self._tests.order_by_descending(lambda user: user.address.street).to_list()
+        res2 = self._tests.order_by_descending(lambda user: user.address.nr).to_list()
+        s_res = self._tests.to_list()
+        s_res.sort(key=lambda user: user.address.street, reverse=True)
+
+        self.assertEqual(res, s_res)
+        s_res = self._tests.to_list()
+        s_res.sort(key=lambda user: user.address.nr, reverse=True)
+        self.assertEqual(res2, s_res)
+
+    def test_then_by(self):
+        res = self._tests.order_by(lambda user: user.address.street).then_by(lambda user: user.address.nr).to_list()
+
+        s_res = self._tests.to_list()
+        s_res.sort(key=lambda user: (user.address.street, user.address.nr))
+
+        self.assertEqual(res, s_res)
+
+    def test_then_by_descending(self):
+        res = self._tests.order_by_descending(lambda user: user.address.street).then_by_descending(lambda user: user.address.nr).to_list()
+
+        s_res = self._tests.to_list()
+        s_res.sort(key=lambda user: (user.address.street, user.address.nr), reverse=True)
+
+        self.assertEqual(res, s_res)
+
+    def test_reverse(self):
+        res = self._tests.reverse().to_list()
+        l_res = self._tests.to_list()
+        l_res.reverse()
+
+        self.assertEqual(res, l_res)
+
+    def test_select(self):
+        range_list = Enumerable(int, range(0, 100))
+        selected_range = range_list.select(lambda x: x + 1)
+
+        modulo_range = []
+        for x in range(0, 100):
+            if x % 2 == 0:
+                modulo_range.append(x)
+        self.assertEqual(selected_range.to_list(), list(range(1, 101)))
+        self.assertEqual(range_list.where(lambda x: x % 2 == 0).to_list(), modulo_range)
+
+    def test_select_many(self):
+        range_list = Enumerable(int, list(range(0, 100)))
+        selected_range = range_list.select(lambda x: [x, x])
+
+        self.assertEqual(selected_range.to_list(), [[x, x] for x in range(0, 100)])
+        self.assertEqual(selected_range.select_many(lambda x: x).to_list(), [_x for _l in [2 * [x] for x in range(0, 100)] for _x in _l])
+
+        class TestClass:
+            def __init__(self, i, is_sub=False):
+                self.i = i
+                if is_sub:
+                    return
+                self.elements = [TestClass(x, True) for x in range(0, 10)]
+
+        elements = Enumerable(TestClass, [TestClass(i) for i in range(0, 100)])
+        selected_elements = elements.select_many(lambda x: x.elements).select(lambda x: x.i)
+        self.assertEqual(selected_elements.where(lambda x: x == 0).count(), 100)
+
+    def test_single(self):
+        res = self._tests.where(lambda u: u.address.nr == self._t_user.address.nr)
+        s_res = self._tests.where(lambda u: u.address.nr == self._t_user.address.nr).single()
+
+        self.assertEqual(len(res), 1)
+        self.assertEqual(self._t_user, s_res)
+
+    def test_single_or_default(self):
+        res = self._tests.where(lambda u: u.address.nr == self._t_user.address.nr)
+        s_res = self._tests.where(lambda u: u.address.nr == self._t_user.address.nr).single_or_default()
+        sn_res = self._tests.where(lambda u: u.address.nr == self._t_user.address.nr + 1).single_or_default()
+
+        self.assertEqual(len(res), 1)
+        self.assertEqual(self._t_user, s_res)
+        self.assertIsNone(sn_res)
+
+    def test_skip(self):
+        skipped = self._tests.skip(5).to_list()
+
+        self.assertEqual(len(skipped), len(self._tests) - 5)
+        self.assertEqual(skipped, self._tests.to_list()[5:])
+
+    def test_skip_last(self):
+        skipped = self._tests.skip_last(5)
+
+        self.assertEqual(skipped.count(), len(self._tests) - 5)
+        self.assertEqual(skipped.to_list(), self._tests.to_list()[:-5])
+        self.assertEqual(skipped.last(), self._tests.to_list()[:-5][len(self._tests.to_list()[:-5]) - 1])
+
+    def test_sum(self):
+        res = self._tests.sum(lambda u: u.address.nr)
+
+        s_res = 0
+        for user in self._tests:
+            s_res += user.address.nr
+
+        self.assertEqual(s_res, res)
+
+        tests = Enumerable(values=list(range(0, 100)))
+        self.assertEqual(0, tests.min())
+
+        def invalid():
+            tests2 = Enumerable(str, ['hello', 'world'])
+            e_res = tests2.average()
+
+        self.assertRaises(InvalidTypeException, invalid)
+
+    def test_take(self):
+        skipped = self._tests.take(5)
+
+        self.assertEqual(skipped.count(), 5)
+        self.assertEqual(skipped.to_list(), self._tests.to_list()[:5])
+
+    def test_take_last(self):
+        skipped = self._tests.take_last(5)
+
+        self.assertEqual(skipped.count(), 5)
+        self.assertEqual(skipped.to_list(), self._tests.to_list()[-5:])
+        self.assertEqual(skipped.last(), self._tests.to_list()[len(self._tests) - 1])
+
+    def test_where(self):
+        results = []
+        for user in self._tests:
+            if user.address.nr == 5:
+                results.append(user)
+
+        res = self._tests.where(lambda u: u.address.nr == 5)
+        self.assertEqual(len(results), len(res))
+
+        def ex():
+            e_res = self._tests.where(None)
+
+        self.assertRaises(ArgumentNoneException, ex)

unittests/unittests_query/enumerable_test_case.py

@@ -0,0 +1,67 @@
+import unittest
+
+from cpl_query.enumerable.enumerable import Enumerable
+
+
+class EnumerableTestCase(unittest.TestCase):
+
+    def setUp(self) -> None:
+        self._list = Enumerable(int)
+
+    def _clear(self):
+        self._list.clear()
+        self.assertEqual(self._list, [])
+
+    def test_append(self):
+        self._list.add(1)
+        self._list.add(2)
+        self._list.add(3)
+
+        self.assertEqual(self._list.to_list(), [1, 2, 3])
+        self.assertRaises(Exception, lambda v: self._list.add(v), '3')
+
+    def test_default(self):
+        self.assertEqual(Enumerable.empty().to_list(), [])
+        self.assertEqual(Enumerable.range(0, 100).to_list(), list(range(0, 100)))
+
+    def test_iter(self):
+        n = 0
+        elements = Enumerable.range(0, 100)
+        while n < 100:
+            self.assertEqual(elements.next(), n)
+            n += 1
+
+    def test_for(self):
+        n = 0
+        for i in Enumerable.range(0, 100):
+            self.assertEqual(i, n)
+            n += 1
+
+    def test_get(self):
+        self._list.add(1)
+        self._list.add(2)
+        self._list.add(3)
+
+        self.assertEqual(self._list.element_at(2), [1, 2, 3][2])
+
+    def test_count(self):
+        self._list.add(1)
+        self._list.add(2)
+        self._list.add(3)
+
+        self.assertEqual(self._list.count(), 3)
+
+    def test_remove(self):
+        old_values = self._list._values
+        self._list.add(1)
+        self.assertNotEqual(old_values, self._list._values)
+        self._list.add(2)
+        self._list.add(3)
+
+        self.assertEqual(self._list.to_list(), [1, 2, 3])
+        self.assertRaises(Exception, lambda v: self._list.add(v), '3')
+        old_values = self._list._values
+        self._list.remove(3)
+        self.assertNotEqual(old_values, self._list._values)
+        self.assertEqual(self._list.to_list(), [1, 2])
+        self.assertRaises(Exception, lambda v: self._list.add(v), '3')

unittests/unittests_query/iterable_query_test_case.py

@@ -8,7 +8,7 @@ from cpl_query.extension.list import List
 from unittests_query.models import User, Address
 
 
-class QueryTestCase(unittest.TestCase):
+class IterableQueryTestCase(unittest.TestCase):
 
     def setUp(self) -> None:
         self._tests = List(User)
@@ -19,6 +19,13 @@ class QueryTestCase(unittest.TestCase):
                 15
             )
         )
+        self._t_user2 = User(
+            'Test user',
+            Address(
+                'teststr.',
+                14
+            )
+        )
 
         self._generate_test_data()
 
@@ -35,6 +42,7 @@ class QueryTestCase(unittest.TestCase):
             self._tests.append(user)
 
         self._tests.append(self._t_user)
+        self._tests.append(self._t_user2)
 
     def test_any(self):
         results = []
@@ -143,6 +151,8 @@ class QueryTestCase(unittest.TestCase):
 
         self.assertEqual(len(res), len(results))
         self.assertEqual(res[0], s_res)
+        self.assertEqual(res[0], res.first())
+        self.assertEqual(res.first(), res.first())
 
     def test_first_or_default(self):
         results = []
@@ -169,7 +179,7 @@ class QueryTestCase(unittest.TestCase):
 
     def test_max(self):
         res = self._tests.max(lambda u: u.address.nr)
-        self.assertEqual(self._t_user.address.nr, res)
+        self.assertEqual(res, self._t_user.address.nr)
 
         tests = List(values=list(range(0, 100)))
         self.assertEqual(99, tests.max())
@@ -195,40 +205,41 @@ class QueryTestCase(unittest.TestCase):
 
     def test_order_by(self):
         res = self._tests.order_by(lambda user: user.address.street)
-        res2 = self._tests.order_by(lambda user: user.address.nr)
+        res2 = self._tests.order_by(lambda user: user.address.nr).to_list()
-        s_res = self._tests
+        s_res = self._tests.to_list()
         s_res.sort(key=lambda user: user.address.street)
+        self.assertEqual(res.to_list(), s_res)
 
-        self.assertEqual(res, s_res)
+        s_res = self._tests.to_list()
         s_res.sort(key=lambda user: user.address.nr)
         self.assertEqual(res2, s_res)
 
         self.assertEqual(self._t_user, res.where(lambda u: u.address.nr == self._t_user.address.nr).single())
 
     def test_order_by_descending(self):
-        res = self._tests.order_by_descending(lambda user: user.address.street)
+        res = self._tests.order_by_descending(lambda user: user.address.street).to_list()
-        res2 = self._tests.order_by_descending(lambda user: user.address.nr)
+        res2 = self._tests.order_by_descending(lambda user: user.address.nr).to_list()
-        s_res = self._tests
+        s_res = self._tests.to_list()
         s_res.sort(key=lambda user: user.address.street, reverse=True)
 
         self.assertEqual(res, s_res)
+        s_res = self._tests.to_list()
         s_res.sort(key=lambda user: user.address.nr, reverse=True)
         self.assertEqual(res2, s_res)
 
     def test_then_by(self):
-        res = self._tests.order_by(lambda user: user.address.street[0]).then_by(lambda user: user.address.nr)
+        res = self._tests.order_by(lambda user: user.address.street).then_by(lambda user: user.address.nr).to_list()
 
-        s_res = self._tests
+        s_res = self._tests.to_list()
-        s_res.sort(key=lambda user: (user.address.street[0], user.address.nr))
+        s_res.sort(key=lambda user: (user.address.street, user.address.nr))
 
         self.assertEqual(res, s_res)
 
     def test_then_by_descending(self):
-        res = self._tests.order_by_descending(lambda user: user.address.street[0]).then_by_descending(
+        res = self._tests.order_by_descending(lambda user: user.address.street).then_by_descending(lambda user: user.address.nr).to_list()
-            lambda user: user.address.nr)
 
-        s_res = self._tests
+        s_res = self._tests.to_list()
-        s_res.sort(key=lambda user: (user.address.street[0], user.address.nr), reverse=True)
+        s_res.sort(key=lambda user: (user.address.street, user.address.nr), reverse=True)
 
         self.assertEqual(res, s_res)
 
@@ -237,7 +248,7 @@ class QueryTestCase(unittest.TestCase):
         l_res = self._tests.to_list()
         l_res.reverse()
 
-        self.assertEqual(l_res, res)
+        self.assertEqual(res.to_list(), l_res)
 
     def test_select(self):
         range_list = List(int, range(0, 100))
@@ -251,10 +262,10 @@ class QueryTestCase(unittest.TestCase):
         self.assertEqual(range_list.where(lambda x: x % 2 == 0).to_list(), modulo_range)
 
     def test_select_many(self):
-        range_list = List(int, range(0, 100))
+        range_list = List(int, list(range(0, 100)))
         selected_range = range_list.select(lambda x: [x, x])
 
-        self.assertEqual(selected_range, [[x, x] for x in range(0, 100)])
+        self.assertEqual(selected_range.to_list(), [[x, x] for x in range(0, 100)])
         self.assertEqual(selected_range.select_many(lambda x: x).to_list(), [_x for _l in [2 * [x] for x in range(0, 100)] for _x in _l])
 
         class TestClass:
@@ -285,17 +296,17 @@ class QueryTestCase(unittest.TestCase):
         self.assertIsNone(sn_res)
 
     def test_skip(self):
-        skipped = self._tests.skip(5)
+        skipped = self._tests.skip(5).to_list()
 
-        self.assertEqual(len(self._tests) - 5, len(skipped))
+        self.assertEqual(len(skipped), len(self._tests) - 5)
-        self.assertEqual(self._tests[5:], skipped)
+        self.assertEqual(skipped, self._tests[5:])
 
     def test_skip_last(self):
         skipped = self._tests.skip_last(5)
 
-        self.assertEqual(len(self._tests) - 5, len(skipped))
+        self.assertEqual(skipped.count(), len(self._tests) - 5)
-        self.assertEqual(self._tests[:-5], skipped)
+        self.assertEqual(skipped.to_list(), self._tests[:-5])
-        self.assertEqual(self._tests[:-5][len(self._tests[:-5]) - 1], skipped.last())
+        self.assertEqual(skipped.last(), self._tests[:-5][len(self._tests[:-5]) - 1])
 
     def test_sum(self):
         res = self._tests.sum(lambda u: u.address.nr)
@@ -318,15 +329,15 @@ class QueryTestCase(unittest.TestCase):
     def test_take(self):
         skipped = self._tests.take(5)
 
-        self.assertEqual(5, len(skipped))
+        self.assertEqual(skipped.count(), 5)
-        self.assertEqual(self._tests[:5], skipped)
+        self.assertEqual(skipped.to_list(), self._tests[:5])
 
     def test_take_last(self):
         skipped = self._tests.take_last(5)
 
-        self.assertEqual(5, len(skipped))
+        self.assertEqual(skipped.count(), 5)
-        self.assertEqual(self._tests[-5:], skipped)
+        self.assertEqual(skipped.to_list(), self._tests[-5:])
-        self.assertEqual(self._tests[len(self._tests) - 1], skipped.last())
+        self.assertEqual(skipped.last(), self._tests[len(self._tests) - 1])
 
     def test_where(self):
         results = []

unittests/unittests_query/iterable_test_case.py

@@ -17,5 +17,19 @@ class IterableTestCase(unittest.TestCase):
         self._list.append(2)
         self._list.append(3)
 
-        self.assertEqual(self._list, [1, 2, 3])
+        self.assertEqual(self._list.to_list(), [1, 2, 3])
+        self.assertRaises(Exception, lambda v: self._list.append(v), '3')
+
+    def test_assign(self):
+        self._list.append(1)
+        self._list.append(2)
+        self._list.append(3)
+        self._list[0] = 42
+        self.assertEqual(self._list[0], 42)
+        self._list[0] = 1
+        self._list.append(42)
+        self.assertEqual(self._list[3], 42)
+        del self._list[3]
+
+        self.assertEqual(self._list.to_list(), [1, 2, 3])
         self.assertRaises(Exception, lambda v: self._list.append(v), '3')

unittests/unittests_query/performance_test_case.py

@@ -0,0 +1,68 @@
+import sys
+import timeit
+import unittest
+
+from cpl_query.enumerable import Enumerable
+from cpl_query.iterable import Iterable
+
+VALUES = 1000
+COUNT = 75
+
+
+class PerformanceTestCase(unittest.TestCase):
+
+    def setUp(self):
+        i = 0
+        self.values = []
+        while i < VALUES:
+            self.values.append(i)
+            i += 1
+
+    def test_range(self):
+        default = timeit.timeit(lambda: list(self.values), number=COUNT)
+        enumerable = timeit.timeit(lambda: Enumerable(int, self.values), number=COUNT)
+        iterable = timeit.timeit(lambda: Iterable(int, self.values), number=COUNT)
+
+        print('Range')
+        print(f'd: {default}s')
+        print(f'i: {iterable}s')
+        print(f'e: {enumerable}s')
+
+        self.assertLess(default, enumerable)
+        self.assertLess(default, iterable)
+
+    def test_where_single(self):
+        default = timeit.timeit(lambda: [x for x in list(self.values) if x == 50], number=COUNT)
+        iterable = timeit.timeit(lambda: Iterable(int, self.values).where(lambda x: x == 50).single(), number=COUNT)
+        enumerable = timeit.timeit(lambda: Enumerable(int, self.values).where(lambda x: x == 50).single(), number=COUNT)
+
+        print('Where single')
+        print(f'd: {default}s')
+        print(f'i: {iterable}s')
+        print(f'e: {enumerable}s')
+
+        self.assertLess(default, enumerable)
+        self.assertLess(default, iterable)
+
+    def test_where_single_complex(self):
+        class TestModel:
+
+            def __init__(self, v, tm=None):
+                self.value = v
+                self.tm = tm
+
+        values = []
+        for i in range(VALUES):
+            values.append(TestModel(i, TestModel(i + 1)))
+
+        default = timeit.timeit(lambda: [x for x in list(values) if x.tm.value == 50], number=COUNT)
+        iterable = timeit.timeit(lambda: Iterable(TestModel, values).where(lambda x: x.tm.value == 50).single(), number=COUNT)
+        enumerable = timeit.timeit(lambda: Enumerable(TestModel, values).where(lambda x: x.tm.value == 50).single(), number=COUNT)
+
+        print('Complex where single')
+        print(f'd: {default}s')
+        print(f'i: {iterable}s')
+        print(f'e: {enumerable}s')
+
+        self.assertLess(default, enumerable)
+        self.assertLess(default, iterable)

unittests/unittests_query/query_test_suite.py

@@ -1,7 +1,10 @@
 import unittest
 
+from unittests_query.enumerable_query_test_case import EnumerableQueryTestCase
+from unittests_query.enumerable_test_case import EnumerableTestCase
+from unittests_query.iterable_query_test_case import IterableQueryTestCase
 from unittests_query.iterable_test_case import IterableTestCase
-from unittests_query.query_test_case import QueryTestCase
+from unittests_query.sequence_test_case import SequenceTestCase
 
 
 class QueryTestSuite(unittest.TestSuite):
@@ -10,8 +13,16 @@ class QueryTestSuite(unittest.TestSuite):
         unittest.TestSuite.__init__(self)
 
         loader = unittest.TestLoader()
-        self.addTests(loader.loadTestsFromTestCase(QueryTestCase))
+        self.addTests(loader.loadTestsFromTestCase(SequenceTestCase))
+        self.addTests(loader.loadTestsFromTestCase(EnumerableTestCase))
+        self.addTests(loader.loadTestsFromTestCase(EnumerableQueryTestCase))
         self.addTests(loader.loadTestsFromTestCase(IterableTestCase))
+        self.addTests(loader.loadTestsFromTestCase(IterableQueryTestCase))
 
     def run(self, *args):
         super().run(*args)
+
+
+if __name__ == "__main__":
+    runner = unittest.TextTestRunner()
+    runner.run(QueryTestSuite())

unittests/unittests_query/sequence_test_case.py

@@ -0,0 +1,32 @@
+import unittest
+
+from cpl_query.enumerable import Enumerable
+from cpl_query.extension.list import List
+from cpl_query.iterable import Iterable
+
+
+class SequenceTestCase(unittest.TestCase):
+
+    def test_to_list(self):
+        _list = List().extend(range(0, 100))
+        enumerable = Enumerable.range(0, 100)
+        iterable = Iterable(int, list(range(0, 100)))
+
+        self.assertEqual(enumerable.to_list(), _list.to_list())
+        self.assertEqual(iterable.to_list(), _list.to_list())
+
+    def test_to_enumerable(self):
+        _list = List().extend(range(0, 100))
+        enumerable = Enumerable.range(0, 100)
+        iterable = Iterable(int, list(range(0, 100)))
+
+        self.assertEqual(type(_list.to_enumerable()), type(enumerable))
+        self.assertEqual(type(iterable.to_enumerable()), type(enumerable))
+
+    def test_to_iterable(self):
+        _list = List().extend(range(0, 100))
+        enumerable = Enumerable.range(0, 100)
+        iterable = Iterable(int, list(range(0, 100)))
+
+        self.assertEqual(type(_list.to_iterable()), type(iterable))
+        self.assertEqual(type(enumerable.to_iterable()), type(iterable))