src/cpl_query/base/default_lambda.py

@@ -1,2 +0,0 @@
-def default_lambda(x: object):
-    return x

src/cpl_query/base/ordered_queryable.py

@@ -1,34 +0,0 @@
-from collections.abc import Callable
-
-from cpl_query.base.ordered_queryable_abc import OrderedQueryableABC
-from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
-from cpl_query.iterable.iterable import Iterable
-
-
-class OrderedQueryable(OrderedQueryableABC):
-    r"""Implementation of :class: `cpl_query.extension.Iterable` `cpl_query.extension.OrderedIterableABC`
-    """
-
-    def __init__(self, _t: type, _values: Iterable = None, _func: Callable = None):
-        OrderedQueryableABC.__init__(self, _t, _values, _func)
-
-    def then_by(self: OrderedQueryableABC, _func: Callable) -> OrderedQueryableABC:
-        if self is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None:
-            raise ArgumentNoneException(ExceptionArgument.func)
-
-        self._funcs.append(_func)
-
-        return OrderedQueryable(self.type, sorted(self, key=lambda *args: [f(*args) for f in self._funcs]), _func)
-
-    def then_by_descending(self: OrderedQueryableABC, _func: Callable) -> OrderedQueryableABC:
-        if self is None:
-            raise ArgumentNoneException(ExceptionArgument.list)
-
-        if _func is None:
-            raise ArgumentNoneException(ExceptionArgument.func)
-
-        self._funcs.append(_func)
-        return OrderedQueryable(self.type, sorted(self, key=lambda *args: [f(*args) for f in self._funcs], reverse=True), _func)

src/cpl_query/base/queryable_abc.py

@@ -1,19 +1,10 @@
+from abc import abstractmethod, ABC
 from typing import Optional, Callable, Union
 
-from cpl_query._helper import is_number
-from cpl_query.base.sequence_abc import SequenceABC
-from cpl_query.exceptions import InvalidTypeException, ArgumentNoneException, ExceptionArgument, IndexOutOfRangeException
 
+class QueryableABC(ABC):
 
-def _default_lambda(x: object):
+    @abstractmethod
-    return x
-
-
-class QueryableABC(SequenceABC):
-
-    def __init__(self, t: type = None, values: list = None):
-        SequenceABC.__init__(self, t, values)
-
     def all(self, _func: Callable = None) -> bool:
         r"""Checks if every element of list equals result found by function
 
@@ -26,11 +17,9 @@ class QueryableABC(SequenceABC):
         -------
             bool
         """
-        if _func is None:
+        pass
-            _func = _default_lambda
-
-        return self.count(_func) == self.count()
 
+    @abstractmethod
     def any(self, _func: Callable = None) -> bool:
         r"""Checks if list contains result found by function
 
@@ -43,11 +32,9 @@ class QueryableABC(SequenceABC):
         -------
             bool
         """
-        if _func is None:
+        pass
-            _func = _default_lambda
-
-        return self.where(_func).count() > 0
 
+    @abstractmethod
     def average(self, _func: Callable = None) -> Union[int, float, complex]:
         r"""Returns average value of list
 
@@ -60,12 +47,10 @@ class QueryableABC(SequenceABC):
         -------
             Union[int, float, complex]
         """
-        if _func is None and not is_number(self.type):
+        pass
-            raise InvalidTypeException()
 
-        return self.sum(_func) / self.count()
+    @abstractmethod
-
+    def contains(self, value: object) -> bool:
-    def contains(self, _value: object) -> bool:
         r"""Checks if list contains value given by function
 
         Parameter
@@ -77,11 +62,9 @@ class QueryableABC(SequenceABC):
         -------
             bool
         """
-        if _value is None:
+        pass
-            raise ArgumentNoneException(ExceptionArgument.value)
-
-        return self.where(lambda x: x == _value).count() > 0
 
+    @abstractmethod
     def count(self, _func: Callable = None) -> int:
         r"""Returns length of list or count of found elements
 
@@ -94,11 +77,9 @@ class QueryableABC(SequenceABC):
         -------
             int
         """
-        if _func is None:
+        pass
-            return self.__len__()
-
-        return self.where(_func).__len__()
 
+    @abstractmethod
     def distinct(self, _func: Callable = None) -> 'QueryableABC':
         r"""Returns list without redundancies
 
@@ -111,62 +92,39 @@ class QueryableABC(SequenceABC):
         -------
             :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
-        if _func is None:
+        pass
-            _func = _default_lambda
 
-        result = []
+    @abstractmethod
-        known_values = []
+    def element_at(self, index: int) -> any:
-        for element in self:
-            value = _func(element)
-            if value in known_values:
-                continue
-
-            known_values.append(value)
-            result.append(element)
-
-        return type(self)(self._type, result)
-
-    def element_at(self, _index: int) -> any:
         r"""Returns element at given index
 
         Parameter
         ---------
-            _index: :class:`int`
+            index: :class:`int`
                 index
 
         Returns
         -------
-            Value at _index: any
+            Value at index: any
         """
-        if _index is None:
+        pass
-            raise ArgumentNoneException(ExceptionArgument.index)
 
-        result = self[_index]
+    @abstractmethod
-        if result is None:
+    def element_at_or_default(self, index: int) -> Optional[any]:
-            raise IndexOutOfRangeException
-
-        return result
-
-    def element_at_or_default(self, _index: int) -> Optional[any]:
         r"""Returns element at given index or None
 
         Parameter
         ---------
-            _index: :class:`int`
+            index: :class:`int`
                 index
 
         Returns
         -------
-            Value at _index: Optional[any]
+            Value at index: Optional[any]
         """
-        if _index is None:
+        pass
-            raise ArgumentNoneException(ExceptionArgument.index)
-
-        try:
-            return self[_index]
-        except IndexError:
-            return None
 
+    @abstractmethod
     def first(self) -> any:
         r"""Returns first element
 
@@ -174,11 +132,9 @@ class QueryableABC(SequenceABC):
         -------
             First element of list: any
         """
-        if len(self) == 0:
+        pass
-            raise IndexOutOfRangeException()
-
-        return self[0]
 
+    @abstractmethod
     def first_or_default(self) -> any:
         r"""Returns first element or None
 
@@ -186,11 +142,9 @@ class QueryableABC(SequenceABC):
         -------
             First element of list: Optional[any]
         """
-        if len(self) == 0:
+        pass
-            return None
-
-        return self[0]
 
+    @abstractmethod
     def for_each(self, _func: Callable = None):
         r"""Runs given function for each element of list
 
@@ -199,36 +153,9 @@ class QueryableABC(SequenceABC):
             func: :class: `Callable`
                 function to call
         """
-        if _func is not None:
+        pass
-            for element in self:
-                _func(element)
-
-        return self
-
-    def group_by(self, _func: Callable = None) -> 'QueryableABC':
-        r"""Groups by func
-
-        Returns
-        -------
-            Grouped list[list[any]]: any
-        """
-        if _func is None:
-            _func = _default_lambda
-        groups = {}
-
-        for v in self:
-            value = _func(v)
-            if v not in groups:
-                groups[value] = []
-
-            groups[value].append(v)
-
-        v = []
-        for g in groups.values():
-            v.append(type(self)(None, g))
-        x = type(self)(type(self), v)
-        return x
 
+    @abstractmethod
     def last(self) -> any:
         r"""Returns last element
 
@@ -236,11 +163,9 @@ class QueryableABC(SequenceABC):
         -------
             Last element of list: any
         """
-        if len(self) == 0:
+        pass
-            raise IndexOutOfRangeException()
-
-        return self[len(self) - 1]
 
+    @abstractmethod
     def last_or_default(self) -> any:
         r"""Returns last element or None
 
@@ -248,11 +173,9 @@ class QueryableABC(SequenceABC):
         -------
             Last element of list: Optional[any]
         """
-        if len(self) == 0:
+        pass
-            return None
-
-        return self[len(self) - 1]
 
+    @abstractmethod
     def max(self, _func: Callable = None) -> Union[int, float, complex]:
         r"""Returns the highest value
 
@@ -265,33 +188,19 @@ class QueryableABC(SequenceABC):
         -------
             Union[int, float, complex]
         """
-        if _func is None and not is_number(self.type):
+        pass
-            raise InvalidTypeException()
 
-        if _func is None:
+    @abstractmethod
-            _func = _default_lambda
+    def median(self) -> Union[int, float]:
-
-        return _func(max(self, key=_func))
-
-    def median(self, _func=None) -> Union[int, float]:
         r"""Return the median value of data elements
 
         Returns
         -------
             Union[int, float]
         """
-        if _func is None:
+        pass
-            _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)
-        )
 
+    @abstractmethod
     def min(self, _func: Callable = None) -> Union[int, float, complex]:
         r"""Returns the lowest value
 
@@ -304,14 +213,9 @@ class QueryableABC(SequenceABC):
         -------
             Union[int, float, complex]
         """
-        if _func is None and not is_number(self.type):
+        pass
-            raise InvalidTypeException()
-
-        if _func is None:
-            _func = _default_lambda
-
-        return _func(min(self, key=_func))
 
+    @abstractmethod
     def order_by(self, _func: Callable = None) -> 'QueryableABC':
         r"""Sorts elements by function in ascending order
 
@@ -324,12 +228,9 @@ class QueryableABC(SequenceABC):
         -------
             :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
-        if _func is None:
+        pass
-            _func = _default_lambda
-
-        from cpl_query.base.ordered_queryable import OrderedQueryable
-        return OrderedQueryable(self.type, sorted(self, key=_func), _func)
 
+    @abstractmethod
     def order_by_descending(self, _func: Callable = None) -> 'QueryableABC':
         r"""Sorts elements by function in descending order
 
@@ -342,12 +243,9 @@ class QueryableABC(SequenceABC):
         -------
             :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
-        if _func is None:
+        pass
-            _func = _default_lambda
-
-        from cpl_query.base.ordered_queryable import OrderedQueryable
-        return OrderedQueryable(self.type, sorted(self, key=_func, reverse=True), _func)
 
+    @abstractmethod
     def reverse(self) -> 'QueryableABC':
         r"""Reverses list
 
@@ -355,31 +253,29 @@ class QueryableABC(SequenceABC):
         -------
             :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
-        return type(self)(self._type, list(reversed(self)))
+        pass
 
-    def select(self, _func: Callable) -> 'QueryableABC':
+    @abstractmethod
+    def select(self, _f: Callable) -> 'QueryableABC':
         r"""Formats each element of list to a given format
 
         Returns
         -------
             :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
-        if _func is None:
+        pass
-            _func = _default_lambda
 
-        return type(self)(any, [_func(_o) for _o in self])
+    @abstractmethod
-
+    def select_many(self, _f: Callable) -> 'QueryableABC':
-    def select_many(self, _func: Callable) -> 'QueryableABC':
         r"""Flattens resulting lists to one
 
         Returns
         -------
             :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
-        # The line below is pain. I don't understand anything of it...
+        pass
-        # written on 09.11.2022 by Sven Heidemann
-        return type(self)(any, [_a for _o in self for _a in _func(_o)])
 
+    @abstractmethod
     def single(self) -> any:
         r"""Returns one single element of list
 
@@ -392,13 +288,9 @@ class QueryableABC(SequenceABC):
             ArgumentNoneException: when argument is None
             Exception: when argument is None or found more than one element
         """
-        if len(self) > 1:
+        pass
-            raise Exception('Found more than one element')
-        elif len(self) == 0:
-            raise Exception('Found no element')
-
-        return self[0]
 
+    @abstractmethod
     def single_or_default(self) -> Optional[any]:
         r"""Returns one single element of list
 
@@ -406,48 +298,39 @@ class QueryableABC(SequenceABC):
         -------
             Found value: Optional[any]
         """
-        if len(self) > 1:
+        pass
-            raise Exception('Index out of range')
-        elif len(self) == 0:
-            return None
 
-        return self[0]
+    @abstractmethod
-
+    def skip(self, index: int) -> 'QueryableABC':
-    def skip(self, _index: int) -> 'QueryableABC':
         r"""Skips all elements from index
 
         Parameter
         ---------
-            _index: :class:`int`
+            index: :class:`int`
                 index
 
         Returns
         -------
             :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
-        if _index is None:
+        pass
-            raise ArgumentNoneException(ExceptionArgument.index)
 
-        return type(self)(self.type, values=self[_index:])
+    @abstractmethod
-
+    def skip_last(self, index: int) -> 'QueryableABC':
-    def skip_last(self, _index: int) -> 'QueryableABC':
         r"""Skips all elements after index
 
         Parameter
         ---------
-            _index: :class:`int`
+            index: :class:`int`
                 index
 
         Returns
         -------
             :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
-        if _index is None:
+        pass
-            raise ArgumentNoneException(ExceptionArgument.index)
-
-        index = len(self) - _index
-        return type(self)(self._type, self[:index])
 
+    @abstractmethod
     def sum(self, _func: Callable = None) -> Union[int, float, complex]:
         r"""Sum of all values
 
@@ -460,54 +343,39 @@ class QueryableABC(SequenceABC):
         -------
             Union[int, float, complex]
         """
-        if _func is None and not is_number(self.type):
+        pass
-            raise InvalidTypeException()
 
-        if _func is None:
+    @abstractmethod
-            _func = _default_lambda
+    def take(self, index: int) -> 'QueryableABC':
-
-        result = 0
-        for x in self:
-            result += _func(x)
-
-        return result
-
-    def take(self, _index: int) -> 'QueryableABC':
         r"""Takes all elements from index
 
         Parameter
         ---------
-            _index: :class:`int`
+            index: :class:`int`
                 index
 
         Returns
         -------
             :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
-        if _index is None:
+        pass
-            raise ArgumentNoneException(ExceptionArgument.index)
 
-        return type(self)(self._type, self[:_index])
+    @abstractmethod
-
+    def take_last(self, index: int) -> 'QueryableABC':
-    def take_last(self, _index: int) -> 'QueryableABC':
         r"""Takes all elements after index
 
         Parameter
         ---------
-            _index: :class:`int`
+            index: :class:`int`
                 index
 
         Returns
         -------
             :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
-        index = len(self) - _index
+        pass
-
-        if index >= len(self) or index < 0:
-            raise IndexOutOfRangeException()
-
-        return type(self)(self._type, self[index:])
 
+    @abstractmethod
     def where(self, _func: Callable = None) -> 'QueryableABC':
         r"""Select element by function
 
@@ -520,15 +388,4 @@ class QueryableABC(SequenceABC):
         -------
             :class: `cpl_query.base.queryable_abc.QueryableABC`
         """
-        if _func is None:
+        pass
-            raise ArgumentNoneException(ExceptionArgument.func)
-
-        if _func is None:
-            _func = _default_lambda
-
-        result = []
-        for element in self:
-            if _func(element):
-                result.append(element)
-
-        return type(self)(self.type, result)

src/cpl_query/base/sequence_abc.py

@@ -1,86 +0,0 @@
-from abc import ABC, abstractmethod
-from itertools import islice
-
-from cpl_query.base.sequence_values import SequenceValues
-
-
-class SequenceABC(ABC):
-
-    @abstractmethod
-    def __init__(self, t: type = None, values: list = None):
-        ABC.__init__(self)
-        if values is None:
-            values = []
-
-        if t is None and len(values) > 0:
-            t = type(values[0])
-
-        if t is None:
-            t = any
-
-        self._type = t
-        self._set_values(values)
-
-    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 __getitem__(self, n):
-        values = [x for x in self]
-        if isinstance(n, slice):
-            try:
-                return values[n]
-            except Exception as e:
-                raise e
-
-        for i in range(len(values)):
-            if i == n:
-                return values[i]
-
-    def __repr__(self):
-        return f'<{type(self).__name__} {list(self).__repr__()}>'
-
-    @property
-    def type(self) -> type:
-        return self._type
-
-    def _check_type(self, __object: any):
-        if self._type == any:
-            return
-
-        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}')
-
-    def _set_values(self, values: list):
-        self._values = SequenceValues(values, 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]
-
-    @classmethod
-    def empty(cls) -> 'SequenceABC':
-        r"""Returns an empty sequence
-
-        Returns
-        -------
-            Sequence object that contains no elements
-        """
-        return cls()
-
-    @classmethod
-    def range(cls, start: int, length: int) -> 'SequenceABC':
-        return cls(int, list(range(start, length)))

src/cpl_query/base/sequence_values.py

@@ -5,13 +5,15 @@ from cpl_query.exceptions import IndexOutOfRangeException
 
 
 class SequenceValues:
-    def __init__(self, data: list, _t: type):
+    def __init__(self, data, _t: type):
+        if data is None:
+            data = []
+
         if len(data) > 0:
             def type_check(_t: type, _l: list):
-                return all([_t == any or isinstance(x, _t) for x in _l])
+                return all(isinstance(x, _t) for x in _l)
 
             if not type_check(_t, data):
-                print([type(x) for x in data])
                 raise Exception(f'Unexpected type\nExpected type: {_t}')
 
         if not hasattr(data, '__iter__'):
@@ -28,7 +30,7 @@ class SequenceValues:
 
     def __iter__(self):
         i = 0
-        while i < self._len():
+        while i < len(self):
             yield next(self._cycle)
             i += 1
 

src/cpl_query/enumerable/__init__.py

@@ -19,9 +19,12 @@ __version__ = '2022.10.0.post2'
 
 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='0.post2')

src/cpl_query/enumerable/enumerable.py

@@ -1,4 +1,9 @@
+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):
@@ -9,5 +14,294 @@ class Enumerable(EnumerableABC):
     r"""Implementation of :class: `cpl_query.enumerable.enumerable_abc.EnumerableABC`
     """
 
-    def __init__(self, t: type = None, values: list = None):
+    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()
+
+        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
+
+        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()
+
+        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
+
+        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

@@ -1,6 +1,8 @@
 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):
@@ -9,15 +11,81 @@ class EnumerableABC(QueryableABC):
 
     @abstractmethod
     def __init__(self, t: type = None, values: list = None):
-        QueryableABC.__init__(self, t, values)
+        if t == any or t is None and values is not None:
+            t = type(values[0])
 
-        self._remove_error_check = True
+        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`
 
@@ -27,3 +95,12 @@ class EnumerableABC(QueryableABC):
         """
         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/iterable/__init__.py

@@ -23,6 +23,8 @@ 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='0.post2')

src/cpl_query/iterable/iterable.py

@@ -1,6 +1,9 @@
-from typing import Iterable as IterableType
+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):
@@ -11,3 +14,318 @@ 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)
+
+        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
+
+        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)
+
+        result = Iterable()
+        result.extend(self[:_index])
+        return result
+
+    def take_last(self, _index: int) -> IterableABC:
+        if self is None:
+            raise ArgumentNoneException(ExceptionArgument.list)
+
+        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

@@ -4,45 +4,54 @@ from typing import Iterable
 from cpl_query.base.queryable_abc import QueryableABC
 
 
-class IterableABC(QueryableABC):
+class IterableABC(list, QueryableABC):
     r"""ABC to define functions on list
     """
 
     @abstractmethod
     def __init__(self, t: type = None, values: Iterable = None):
-        QueryableABC.__init__(self, t, values)
+        values = [] if values is None else values
+        list.__init__(self, values)
 
-    def __setitem__(self, i, val):
+        if t is None and len(values) > 0:
-        self._check_type(val)
+            t = type(values[0])
-        values = [*self._values]
-        values[i] = val
-        self._set_values(values)
 
-    def __delitem__(self, i):
+        self._type = t
-        values = [*self._values]
+
-        del values[i]
+    def __repr__(self):
-        self._set_values(values)
+        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):
+    def append(self, __object: object) -> None:
-        self.add(_object)
-
-    def add(self, _object: object):
         r"""Adds element to list
         Parameter
         ---------
-            _object: :class:`object`
+            __object: :class:`object`
                 value
         """
-        self._check_type(_object)
+        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):
-        values = [*self._values, _object]
+            raise Exception(f'Unexpected type: {type(__object)}\nExpected type: {self._type}')
-        self._set_values(values)
+
+        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

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

@@ -2,20 +2,20 @@ from abc import abstractmethod
 from collections.abc import Callable
 from typing import Iterable
 
-from cpl_query.base.queryable_abc import QueryableABC
+from cpl_query.iterable.iterable_abc import IterableABC
 
 
-class OrderedQueryableABC(QueryableABC):
+class OrderedIterableABC(IterableABC):
 
     @abstractmethod
-    def __init__(self, _t: type, _values: Iterable = None, _func: Callable = None):
+    def __init__(self, _t: type, _func: Callable = None, _values: Iterable = None):
-        QueryableABC.__init__(self, _t, _values)
+        IterableABC.__init__(self, _t, _values)
         self._funcs: list[Callable] = []
         if _func is not None:
             self._funcs.append(_func)
 
     @abstractmethod
-    def then_by(self, func: Callable) -> 'OrderedQueryableABC':
+    def then_by(self, func: Callable) -> 'OrderedIterableABC':
         r"""Sorts OrderedList in ascending order by function
 
         Parameter
@@ -29,7 +29,7 @@ class OrderedQueryableABC(QueryableABC):
         pass
 
     @abstractmethod
-    def then_by_descending(self, func: Callable) -> 'OrderedQueryableABC':
+    def then_by_descending(self, func: Callable) -> 'OrderedIterableABC':
         r"""Sorts OrderedList in descending order by function
 
         Parameter

unittests/unittests_cli/abc/command_test_case.py

@@ -1,35 +0,0 @@
-import os
-import shutil
-import traceback
-import unittest
-
-from unittests_cli.constants import PLAYGROUND_PATH
-
-
-class CommandTestCase(unittest.TestCase):
-
-    def __init__(self, method_name: str):
-        unittest.TestCase.__init__(self, method_name)
-
-    @classmethod
-    def setUpClass(cls):
-
-        try:
-            if os.path.exists(PLAYGROUND_PATH):
-                shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH)))
-
-            os.makedirs(PLAYGROUND_PATH)
-            os.chdir(PLAYGROUND_PATH)
-        except Exception as e:
-            print(f'Setup of {__name__} failed: {traceback.format_exc()}')
-
-    def setUp(self):
-        os.chdir(PLAYGROUND_PATH)
-
-    @classmethod
-    def tearDownClass(cls):
-        try:
-            if os.path.exists(PLAYGROUND_PATH):
-                shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH)))
-        except Exception as e:
-            print(f'Cleanup of {__name__} failed: {traceback.format_exc()}')

unittests/unittests_cli/add_test_case.py

@@ -1,16 +1,18 @@
 import json
 import os
+import shutil
+import unittest
 
 from cpl_core.utils import String
-from unittests_cli.abc.command_test_case import CommandTestCase
+
 from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_shared.cli_commands import CLICommands
 
 
-class AddTestCase(CommandTestCase):
+class AddTestCase(unittest.TestCase):
 
-    def __init__(self, method_name: str):
+    def __init__(self, methodName: str):
-        CommandTestCase.__init__(self, method_name)
+        unittest.TestCase.__init__(self, methodName)
         self._source = 'add-test-project'
         self._target = 'add-test-library'
         self._project_file = f'src/{String.convert_to_snake_case(self._source)}/{self._source}.json'
@@ -24,12 +26,19 @@ class AddTestCase(CommandTestCase):
         return project_json
 
     def setUp(self):
-        os.chdir(PLAYGROUND_PATH)
+        os.chdir(os.path.abspath(PLAYGROUND_PATH))
         # create projects
         CLICommands.new('console', self._source, '--ab', '--s')
         os.chdir(os.path.join(os.getcwd(), self._source))
         CLICommands.new('console', self._target, '--ab', '--s')
 
+    def cleanUp(self):
+        # remove projects
+        if not os.path.exists(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source))):
+            return
+
+        shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source)))
+
     def test_add(self):
         CLICommands.add(self._source, self._target)
         settings = self._get_project_settings()

unittests/unittests_cli/build_test_case.py

@@ -2,17 +2,18 @@ import filecmp
 import json
 import os
 import shutil
+import unittest
 
 from cpl_core.utils import String
-from unittests_cli.abc.command_test_case import CommandTestCase
+
 from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_shared.cli_commands import CLICommands
 
 
-class BuildTestCase(CommandTestCase):
+class BuildTestCase(unittest.TestCase):
 
-    def __init__(self, method_name: str):
+    def __init__(self, methodName: str):
-        CommandTestCase.__init__(self, method_name)
+        unittest.TestCase.__init__(self, methodName)
         self._source = 'build-test-source'
         self._project_file = f'src/{String.convert_to_snake_case(self._source)}/{self._source}.json'
 
@@ -30,14 +31,18 @@ class BuildTestCase(CommandTestCase):
             project_file.close()
 
     def setUp(self):
-        if not os.path.exists(PLAYGROUND_PATH):
+        os.chdir(os.path.abspath(PLAYGROUND_PATH))
-            os.makedirs(PLAYGROUND_PATH)
-        
-        os.chdir(PLAYGROUND_PATH)
         # create projects
         CLICommands.new('console', self._source, '--ab', '--s')
         os.chdir(os.path.join(os.getcwd(), self._source))
 
+    def cleanUp(self):
+        # remove projects
+        if not os.path.exists(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source))):
+            return
+
+        shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source)))
+
     def _are_dir_trees_equal(self, dir1, dir2):
         """
         found at https://stackoverflow.com/questions/4187564/recursively-compare-two-directories-to-ensure-they-have-the-same-files-and-subdi

unittests/unittests_cli/cli_test_suite.py

@@ -75,9 +75,4 @@ class CLITestSuite(unittest.TestSuite):
     def run(self, *args):
         self._setup()
         self._result = super().run(*args)
-        self._cleanup()
+        # self._cleanup()
-
-
-if __name__ == "__main__":
-    runner = unittest.TextTestRunner()
-    runner.run(CLITestSuite())

unittests/unittests_cli/constants.py

@@ -1,9 +1,5 @@
 import os
 
-base = ''
+PLAYGROUND_PATH = os.path.abspath(os.path.join(os.getcwd(), '../test_cli_playground'))
-if not os.getcwd().endswith('unittests'):
+TRANSLATION_PATH = os.path.abspath(os.path.join(os.getcwd(), '../unittests_translation'))
-    base = '../'
+CLI_PATH = os.path.abspath(os.path.join(os.getcwd(), '../../src/cpl_cli/main.py'))
-
-PLAYGROUND_PATH = os.path.abspath(os.path.join(os.getcwd(), f'{base}test_cli_playground'))
-TRANSLATION_PATH = os.path.abspath(os.path.join(os.getcwd(), f'{base}unittests_translation'))
-CLI_PATH = os.path.abspath(os.path.join(os.getcwd(), f'{base}../src/cpl_cli/main.py'))

unittests/unittests_cli/custom_test_case.py

@@ -1,7 +1,7 @@
-from unittests_cli.abc.command_test_case import CommandTestCase
+import unittest
 
 
-class CustomTestCase(CommandTestCase):
+class CustomTestCase(unittest.TestCase):
 
     def setUp(self):
         pass

unittests/unittests_cli/generate_test_case.py

@@ -1,18 +1,17 @@
 import os.path
+import unittest
 
 from cpl_core.utils import String
-from unittests_cli.abc.command_test_case import CommandTestCase
 from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_shared.cli_commands import CLICommands
 
 
-class GenerateTestCase(CommandTestCase):
+class GenerateTestCase(unittest.TestCase):
     _project = 'test-console'
     _t_path = 'test'
 
     @classmethod
     def setUpClass(cls):
-        CommandTestCase.setUpClass()
         CLICommands.new('console', cls._project, '--ab', '--s', '--venv')
 
     def setUp(self):

unittests/unittests_cli/install_test_case.py

@@ -6,15 +6,14 @@ import sys
 import unittest
 
 from cpl_core.utils import String
-from unittests_cli.abc.command_test_case import CommandTestCase
 from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_shared.cli_commands import CLICommands
 
 
-class InstallTestCase(CommandTestCase):
+class InstallTestCase(unittest.TestCase):
 
-    def __init__(self, method_name: str):
+    def __init__(self, methodName: str):
-        CommandTestCase.__init__(self, method_name)
+        unittest.TestCase.__init__(self, methodName)
         self._source = 'install-test-source'
         self._project_file = f'src/{String.convert_to_snake_case(self._source)}/{self._source}.json'
 
@@ -32,14 +31,18 @@ class InstallTestCase(CommandTestCase):
             project_file.close()
 
     def setUp(self):
-        if not os.path.exists(PLAYGROUND_PATH):
+        os.chdir(os.path.abspath(PLAYGROUND_PATH))
-            os.makedirs(PLAYGROUND_PATH)
-        
-        os.chdir(PLAYGROUND_PATH)
         # create projects
         CLICommands.new('console', self._source, '--ab', '--s')
         os.chdir(os.path.join(os.getcwd(), self._source))
 
+    def cleanUp(self):
+        # remove projects
+        if not os.path.exists(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source))):
+            return
+
+        shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source)))
+
     def _get_installed_packages(self) -> dict:
         reqs = subprocess.check_output([sys.executable, '-m', 'pip', 'freeze'])
         return dict([tuple(r.decode().split('==')) for r in reqs.split()])

unittests/unittests_cli/new_test_case.py

@@ -1,16 +1,16 @@
 import json
 import os
+import unittest
 
 from cpl_core.utils import String
-from unittests_cli.abc.command_test_case import CommandTestCase
 from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_shared.cli_commands import CLICommands
 
 
-class NewTestCase(CommandTestCase):
+class NewTestCase(unittest.TestCase):
 
-    def __init__(self, method_name: str):
+    def setUp(self):
-        CommandTestCase.__init__(self, method_name)
+        os.chdir(os.path.abspath(PLAYGROUND_PATH))
 
     def _test_project(self, project_type: str, name: str, *args, test_venv=False, without_ws=False):
         CLICommands.new(project_type, name, *args)
@@ -70,6 +70,7 @@ class NewTestCase(CommandTestCase):
         project_path = os.path.abspath(os.path.join(PLAYGROUND_PATH, workspace_name, base, String.convert_to_snake_case(name)))
         self.assertTrue(os.path.exists(project_path))
         self.assertTrue(os.path.join(project_path, f'{name}.json'))
+        os.chdir(os.path.abspath(os.path.join(os.getcwd(), '../')))
 
     def _test_sub_directory_project(self, project_type: str, directory: str, name: str, workspace_name: str, *args):
         os.chdir(os.path.abspath(os.path.join(os.getcwd(), workspace_name)))
@@ -95,6 +96,8 @@ class NewTestCase(CommandTestCase):
         self.assertEqual(build_settings['Main'], f'{String.convert_to_snake_case(name)}.main')
         self.assertEqual(build_settings['EntryPoint'], name)
 
+        os.chdir(os.path.abspath(os.path.join(os.getcwd(), '../')))
+
     def test_console(self):
         self._test_project('console', 'test-console', '--ab', '--s', '--venv', test_venv=True)
 

unittests/unittests_cli/publish_test_case.py

@@ -5,16 +5,15 @@ import shutil
 import unittest
 
 from cpl_core.utils import String
-from unittests_cli.abc.command_test_case import CommandTestCase
 
 from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_shared.cli_commands import CLICommands
 
 
-class PublishTestCase(CommandTestCase):
+class PublishTestCase(unittest.TestCase):
 
-    def __init__(self, method_name: str):
+    def __init__(self, methodName: str):
-        CommandTestCase.__init__(self, method_name)
+        unittest.TestCase.__init__(self, methodName)
         self._source = 'publish-test-source'
         self._project_file = f'src/{String.convert_to_snake_case(self._source)}/{self._source}.json'
 
@@ -32,14 +31,18 @@ class PublishTestCase(CommandTestCase):
             project_file.close()
 
     def setUp(self):
-        if not os.path.exists(PLAYGROUND_PATH):
+        os.chdir(os.path.abspath(PLAYGROUND_PATH))
-            os.makedirs(PLAYGROUND_PATH)
-        
-        os.chdir(PLAYGROUND_PATH)
         # create projects
         CLICommands.new('console', self._source, '--ab', '--s')
         os.chdir(os.path.join(os.getcwd(), self._source))
 
+    def cleanUp(self):
+        # remove projects
+        if not os.path.exists(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source))):
+            return
+
+        shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source)))
+
     def _are_dir_trees_equal(self, dir1, dir2):
         """
         found at https://stackoverflow.com/questions/4187564/recursively-compare-two-directories-to-ensure-they-have-the-same-files-and-subdi

unittests/unittests_cli/remove_test_case.py

@@ -3,15 +3,14 @@ import os
 import unittest
 
 from cpl_core.utils import String
-from unittests_cli.abc.command_test_case import CommandTestCase
 from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_shared.cli_commands import CLICommands
 
 
-class RemoveTestCase(CommandTestCase):
+class RemoveTestCase(unittest.TestCase):
 
-    def __init__(self, method_name: str):
+    def __init__(self, methodName: str):
-        CommandTestCase.__init__(self, method_name)
+        unittest.TestCase.__init__(self, methodName)
         self._source = 'add-test-project'
         self._target = 'add-test-library'
         self._project_file = f'src/{String.convert_to_snake_case(self._source)}/{self._source}.json'
@@ -25,10 +24,7 @@ class RemoveTestCase(CommandTestCase):
         return project_json
 
     def setUp(self):
-        if not os.path.exists(PLAYGROUND_PATH):
+        os.chdir(os.path.abspath(PLAYGROUND_PATH))
-            os.makedirs(PLAYGROUND_PATH)
-        
-        os.chdir(PLAYGROUND_PATH)
         # create projects
         CLICommands.new('console', self._source, '--ab', '--s')
         os.chdir(os.path.join(os.getcwd(), self._source))

unittests/unittests_cli/run_test_case.py

@@ -1,18 +1,22 @@
 import json
 import os
 import shutil
+import subprocess
+import sys
 import unittest
 
+import pkg_resources
+
 from cpl_core.utils import String
-from unittests_cli.abc.command_test_case import CommandTestCase
+
 from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_shared.cli_commands import CLICommands
 
 
-class RunTestCase(CommandTestCase):
+class RunTestCase(unittest.TestCase):
 
-    def __init__(self, method_name: str):
+    def __init__(self, methodName: str):
-        CommandTestCase.__init__(self, method_name)
+        unittest.TestCase.__init__(self, methodName)
         self._source = 'run-test'
         self._project_file = f'src/{String.convert_to_snake_case(self._source)}/{self._source}.json'
         self._appsettings = f'src/{String.convert_to_snake_case(self._source)}/appsettings.json'
@@ -46,10 +50,7 @@ class RunTestCase(CommandTestCase):
             project_file.close()
 
     def setUp(self):
-        if not os.path.exists(PLAYGROUND_PATH):
+        os.chdir(os.path.abspath(PLAYGROUND_PATH))
-            os.makedirs(PLAYGROUND_PATH)
-        
-        os.chdir(PLAYGROUND_PATH)
         # create projects
         CLICommands.new('console', self._source, '--ab', '--s')
         os.chdir(os.path.join(os.getcwd(), self._source))
@@ -59,6 +60,13 @@ class RunTestCase(CommandTestCase):
             file.write(f'\t\t{self._test_code}')
             file.close()
 
+    def cleanUp(self):
+        # remove projects
+        if not os.path.exists(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source))):
+            return
+
+        shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source)))
+
     def test_run(self):
         CLICommands.run()
         settings = self._get_appsettings()

unittests/unittests_cli/start_test_case.py

@@ -5,16 +5,15 @@ import time
 import unittest
 
 from cpl_core.utils import String
-from unittests_cli.abc.command_test_case import CommandTestCase
 from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_cli.threads.start_test_thread import StartTestThread
 from unittests_shared.cli_commands import CLICommands
 
 
-class StartTestCase(CommandTestCase):
+class StartTestCase(unittest.TestCase):
 
-    def __init__(self, method_name: str):
+    def __init__(self, methodName: str):
-        CommandTestCase.__init__(self, method_name)
+        unittest.TestCase.__init__(self, methodName)
         self._source = 'start-test'
         self._project_file = f'src/{String.convert_to_snake_case(self._source)}/{self._source}.json'
         self._appsettings = f'src/{String.convert_to_snake_case(self._source)}/appsettings.json'
@@ -51,10 +50,7 @@ class StartTestCase(CommandTestCase):
             project_file.close()
 
     def setUp(self):
-        if not os.path.exists(PLAYGROUND_PATH):
+        os.chdir(os.path.abspath(PLAYGROUND_PATH))
-            os.makedirs(PLAYGROUND_PATH)
-        
-        os.chdir(PLAYGROUND_PATH)
         # create projects
         CLICommands.new('console', self._source, '--ab', '--s')
         os.chdir(os.path.join(os.getcwd(), self._source))
@@ -64,6 +60,13 @@ class StartTestCase(CommandTestCase):
             file.write(f'\t\t{self._test_code}')
             file.close()
 
+    def cleanUp(self):
+        # remove projects
+        if not os.path.exists(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source))):
+            return
+
+        shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source)))
+
     def test_start(self):
         thread = StartTestThread()
         thread.start()

unittests/unittests_cli/uninstall_test_case.py

@@ -6,15 +6,14 @@ import sys
 import unittest
 
 from cpl_core.utils import String
-from unittests_cli.abc.command_test_case import CommandTestCase
 from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_shared.cli_commands import CLICommands
 
 
-class UninstallTestCase(CommandTestCase):
+class UninstallTestCase(unittest.TestCase):
 
-    def __init__(self, method_name: str):
+    def __init__(self, methodName: str):
-        CommandTestCase.__init__(self, method_name)
+        unittest.TestCase.__init__(self, methodName)
         self._source = 'uninstall-test-source'
         self._project_file = f'src/{String.convert_to_snake_case(self._source)}/{self._source}.json'
         self._version = '1.7.3'
@@ -30,14 +29,18 @@ class UninstallTestCase(CommandTestCase):
         return project_json
 
     def setUp(self):
-        if not os.path.exists(PLAYGROUND_PATH):
+        os.chdir(os.path.abspath(PLAYGROUND_PATH))
-            os.makedirs(PLAYGROUND_PATH)
-
-        os.chdir(PLAYGROUND_PATH)
         # create projects
         CLICommands.new('console', self._source, '--ab', '--s')
         os.chdir(os.path.join(os.getcwd(), self._source))
 
+    def cleanUp(self):
+        # remove projects
+        if not os.path.exists(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source))):
+            return
+
+        shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source)))
+
     def _get_installed_packages(self) -> dict:
         reqs = subprocess.check_output([sys.executable, '-m', 'pip', 'freeze'])
         return dict([tuple(r.decode().split('==')) for r in reqs.split()])

unittests/unittests_cli/update_test_case.py

@@ -6,15 +6,14 @@ import sys
 import unittest
 
 from cpl_core.utils import String
-from unittests_cli.abc.command_test_case import CommandTestCase
 from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_shared.cli_commands import CLICommands
 
 
-class UpdateTestCase(CommandTestCase):
+class UpdateTestCase(unittest.TestCase):
 
-    def __init__(self, method_name: str):
+    def __init__(self, methodName: str):
-        CommandTestCase.__init__(self, method_name)
+        unittest.TestCase.__init__(self, methodName)
         self._source = 'install-test-source'
         self._project_file = f'src/{String.convert_to_snake_case(self._source)}/{self._source}.json'
 
@@ -27,15 +26,6 @@ class UpdateTestCase(CommandTestCase):
         self._new_package_name = 'discord.py'
         self._new_package = f'{self._new_package_name}=={self._new_version}'
 
-    def setUp(self):
-        CLICommands.uninstall(self._old_package)
-        CLICommands.uninstall(self._new_package)
-        os.chdir(PLAYGROUND_PATH)
-        # create projects
-        CLICommands.new('console', self._source, '--ab', '--s')
-        os.chdir(os.path.join(os.getcwd(), self._source))
-        CLICommands.install(self._old_package)
-
     def _get_project_settings(self):
         with open(os.path.join(os.getcwd(), self._project_file), 'r', encoding='utf-8') as cfg:
             # load json
@@ -49,6 +39,22 @@ class UpdateTestCase(CommandTestCase):
             project_file.write(json.dumps(settings, indent=2))
             project_file.close()
 
+    def setUp(self):
+        CLICommands.uninstall(self._old_package)
+        CLICommands.uninstall(self._new_package)
+        os.chdir(os.path.abspath(PLAYGROUND_PATH))
+        # create projects
+        CLICommands.new('console', self._source, '--ab', '--s')
+        os.chdir(os.path.join(os.getcwd(), self._source))
+        CLICommands.install(self._old_package)
+
+    def cleanUp(self):
+        # remove projects
+        if not os.path.exists(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source))):
+            return
+
+        shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH, self._source)))
+
     def _get_installed_packages(self) -> dict:
         reqs = subprocess.check_output([sys.executable, '-m', 'pip', 'freeze'])
         return dict([tuple(r.decode().split('==')) for r in reqs.split()])
@@ -79,3 +85,5 @@ class UpdateTestCase(CommandTestCase):
         packages = self._get_installed_packages()
         self.assertIn(self._new_package_name, packages)
         self.assertEqual(self._new_version, packages[self._new_package_name])
+
+

unittests/unittests_cli/version_test_case.py

@@ -12,14 +12,13 @@ import cpl_cli
 from cpl_core.console import ForegroundColorEnum
 from termcolor import colored
 
-from unittests_cli.abc.command_test_case import CommandTestCase
 from unittests_shared.cli_commands import CLICommands
 
 
-class VersionTestCase(CommandTestCase):
+class VersionTestCase(unittest.TestCase):
 
-    def __init__(self, method_name: str):
+    def __init__(self, methodName: str):
-        CommandTestCase.__init__(self, method_name)
+        unittest.TestCase.__init__(self, methodName)
         self._block_banner = ""
         self._block_version = ""
         self._block_package_header = ""

unittests/unittests_query/enumerable_query_test_case.py

@@ -11,16 +11,7 @@ from unittests_query.models import User, Address
 class EnumerableQueryTestCase(unittest.TestCase):
 
     def setUp(self) -> None:
-        users = []
+        self._tests = Enumerable(User)
-        for i in range(0, 100):
-            users.append(User(
-                String.random_string(string.ascii_letters, 8).lower(),
-                Address(
-                    String.random_string(string.ascii_letters, 10).lower(),
-                    randint(1, 10)
-                )
-            ))
-
         self._t_user = User(
             'Test user',
             Address(
@@ -36,10 +27,22 @@ class EnumerableQueryTestCase(unittest.TestCase):
             )
         )
 
-        users.append(self._t_user)
+        self._generate_test_data()
-        users.append(self._t_user2)
 
-        self._tests = Enumerable(User, users)
+    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 = []

unittests/unittests_query/enumerable_test_case.py

@@ -6,9 +6,17 @@ from cpl_query.enumerable.enumerable import Enumerable
 class EnumerableTestCase(unittest.TestCase):
 
     def setUp(self) -> None:
-        self._list = Enumerable(int, list(range(1, 4)))
+        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')
 
@@ -30,7 +38,30 @@ class EnumerableTestCase(unittest.TestCase):
             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

@@ -5,7 +5,6 @@ from random import randint
 from cpl_core.utils import String
 from cpl_query.exceptions import InvalidTypeException, ArgumentNoneException
 from cpl_query.extension.list import List
-from cpl_query.iterable import Iterable
 from unittests_query.models import User, Address
 
 
@@ -103,18 +102,8 @@ class IterableQueryTestCase(unittest.TestCase):
         self.assertEqual(1, self._tests.count(lambda u: u == self._t_user))
 
     def test_distinct(self):
-        res = self._tests.select(lambda u: u.address.nr).where(lambda a: a == 5).distinct()
+        res = self._tests.distinct(lambda u: u.address.nr).where(lambda u: u.address.nr == 5)
-        self.assertEqual(1, res.count())
+        self.assertEqual(1, len(res))
-
-        addresses = []
-        for u in self._tests:
-            if u.address.nr in addresses:
-                continue
-
-            addresses.append(u.address.nr)
-
-        res2 = self._tests.distinct(lambda x: x.address.nr).select(lambda x: x.address.nr).to_list()
-        self.assertEqual(addresses, res2)
 
     def test_element_at(self):
         index = randint(0, len(self._tests) - 1)
@@ -179,29 +168,6 @@ class IterableQueryTestCase(unittest.TestCase):
         self.assertEqual(res[0], s_res)
         self.assertIsNone(sn_res)
 
-    def test_group_by(self):
-        def by_adr(u):
-            return u.address.nr
-
-        t = self._tests.select(by_adr).group_by()
-        res = self._tests.group_by(by_adr)
-        self.assertTrue(isinstance(res.first_or_default(), Iterable))
-        self.assertNotEqual(self._tests.count(), res.count())
-        self.assertEqual(self._tests.distinct(by_adr).count(), res.count())
-
-        elements = List(int)
-        groups = {}
-        for x in range(0, 1000):
-            v = randint(1, 100)
-            if v not in groups:
-                groups[v] = []
-
-            groups[v].append(v)
-            elements.append(v)
-
-        r1, r2 = list(groups.values()), elements.group_by().select(lambda l: l.to_list()).to_list()
-        self.assertEqual(r1, r2)
-
     def test_for_each(self):
         users = []
         self._tests.for_each(lambda user: (

unittests/unittests_query/models.py

@@ -4,15 +4,9 @@ class User:
         self.name = name
         self.address = address
 
-    def __repr__(self):
-        return f'<{type(self).__name__} {self.name} {self.address}>'
-
 
 class Address:
 
     def __init__(self, street, nr):
         self.street = street
         self.nr = nr
-
-    def __repr__(self):
-        return f'<{type(self).__name__} {self.street} {self.nr}>'

unittests/unittests_query/performance_test_case.py

@@ -19,9 +19,9 @@ class PerformanceTestCase(unittest.TestCase):
             i += 1
 
     def test_range(self):
-        default = timeit.timeit(lambda: list(range(0, VALUES)), number=COUNT)
+        default = timeit.timeit(lambda: list(self.values), number=COUNT)
-        iterable = timeit.timeit(lambda: Iterable.range(0, VALUES), number=COUNT)
+        enumerable = timeit.timeit(lambda: Enumerable(int, self.values), number=COUNT)
-        enumerable = timeit.timeit(lambda: Enumerable.range(0, VALUES), number=COUNT)
+        iterable = timeit.timeit(lambda: Iterable(int, self.values), number=COUNT)
 
         print('Range')
         print(f'd: {default}s')
@@ -32,9 +32,9 @@ class PerformanceTestCase(unittest.TestCase):
         self.assertLess(default, iterable)
 
     def test_where_single(self):
-        default = timeit.timeit(lambda: [x for x in list(range(0, VALUES)) if x == 50], number=COUNT)
+        default = timeit.timeit(lambda: [x for x in list(self.values) if x == 50], number=COUNT)
-        iterable = timeit.timeit(lambda: Iterable.range(0, VALUES).where(lambda x: x == 50).single(), number=COUNT)
+        iterable = timeit.timeit(lambda: Iterable(int, self.values).where(lambda x: x == 50).single(), number=COUNT)
-        enumerable = timeit.timeit(lambda: Enumerable.range(0, 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')
@@ -55,7 +55,7 @@ class PerformanceTestCase(unittest.TestCase):
         for i in range(VALUES):
             values.append(TestModel(i, TestModel(i + 1)))
 
-        default = timeit.timeit(lambda: [x for x in values if x.tm.value == 50], number=COUNT)
+        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)
 

unittests/unittests_shared/cli_commands.py

@@ -1,6 +1,5 @@
 import os
 import subprocess
-import sys
 
 from unittests_cli.constants import CLI_PATH
 
@@ -24,7 +23,7 @@ class CLICommands:
     @staticmethod
     def _run_with_output(cmd: str, *args) -> str:
         env_vars = os.environ
-        env_vars['CPL_IS_UNITTEST'] = 'NO'
+        # env_vars['CPL_IS_UNITTEST'] = 'NO'
 
         command = ['python', CLI_PATH, cmd]
         for arg in args:

unittests/unittests_translation/translation_test_suite.py

@@ -1,7 +1,11 @@
+import os
+import shutil
+import traceback
 import unittest
 from typing import Optional
 from unittest import TestResult
 
+from unittests_cli.constants import PLAYGROUND_PATH
 from unittests_translation.translation_test_case import TranslationTestCase
 
 
@@ -21,5 +25,27 @@ class TranslationTestSuite(unittest.TestSuite):
         for test in active_tests:
             self.addTests(loader.loadTestsFromTestCase(test))
 
+    def _setup(self):
+        try:
+            if os.path.exists(PLAYGROUND_PATH):
+                shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH)))
+
+            os.makedirs(PLAYGROUND_PATH)
+            os.chdir(PLAYGROUND_PATH)
+        except Exception as e:
+            print(f'Setup of {__name__} failed: {traceback.format_exc()}')
+
+    def _cleanup(self):
+        try:
+            if self._result is not None and (len(self._result.errors) > 0 or len(self._result.failures) > 0):
+                return
+
+            if os.path.exists(PLAYGROUND_PATH):
+                shutil.rmtree(os.path.abspath(os.path.join(PLAYGROUND_PATH)))
+        except Exception as e:
+            print(f'Cleanup of {__name__} failed: {traceback.format_exc()}')
+
     def run(self, *args):
+        self._setup()
         self._result = super().run(*args)
+        self._cleanup()