cpl-workspace.json

@@ -3,9 +3,9 @@
     "DefaultProject": "cpl_cli",
     "Projects": {
       "cpl": "src/cpl/cpl.json",
-      "cpl_cli": "src/cpl_cli/cpl_cli.json"
+      "cpl_cli": "src/cpl_cli/cpl_cli.json",
+      "cpl_query": "src/cpl_query/cpl_query.json"
     },
-    "Scripts": {
+    "Scripts": {}
-    }
   }
 }

notices/pip.txt

@@ -7,6 +7,10 @@ upload:
             twine upload --repository-url https://pip.sh-edraft.de dist/sh_cpl-cli/publish/setup/*
             twine upload -r pip.sh-edraft.de dist/sh_cpl-cli/publish/setup/*
 
+        query:
+            twine upload --repository-url https://pip-dev.sh-edraft.de dist/sh_cpl-query/publish/setup/*
+            twine upload -r pip-dev.sh-edraft.de dist/sh_cpl-query/publish/setup/*
+
     exp:
         cpl:
             twine upload --repository-url https://pip-exp.sh-edraft.de dist/sh_cpl/publish/setup/*
@@ -16,6 +20,10 @@ upload:
             twine upload --repository-url https://pip-exp.sh-edraft.de dist/sh_cpl-cli/publish/setup/*
             twine upload -r pip-exp.sh-edraft.de dist/sh_cpl-cli/publish/setup/*
 
+        query:
+            twine upload --repository-url https://pip-exp.sh-edraft.de dist/sh_cpl-query/publish/setup/*
+            twine upload -r pip-exp.sh-edraft.de dist/sh_cpl-query/publish/setup/*
+
     dev:
         cpl:
             twine upload --repository-url https://pip-dev.sh-edraft.de dist/sh_cpl/publish/setup/*
@@ -25,15 +33,22 @@ upload:
             twine upload --repository-url https://pip-dev.sh-edraft.de dist/sh_cpl-cli/publish/setup/*
             twine upload -r pip-dev.sh-edraft.de dist/sh_cpl-cli/publish/setup/*
 
+        query:
+            twine upload --repository-url https://pip-dev.sh-edraft.de dist/sh_cpl-query/publish/setup/*
+            twine upload -r pip-dev.sh-edraft.de dist/sh_cpl-query/publish/setup/*
+
 install:
     prod:
         pip install --extra-index-url https://pip.sh-edraft.de/ sh_cpl
         pip install --extra-index-url https://pip.sh-edraft.de/ sh_cpl-cli
+        pip install --extra-index-url https://pip.sh-edraft.de/ sh_cpl-query
 
     exp:
         pip install --extra-index-url https://pip-exp.sh-edraft.de/ sh_cpl
         pip install --extra-index-url https://pip-exp.sh-edraft.de/ sh_cpl-cli
+        pip install --extra-index-url https://pip-exp.sh-edraft.de/ sh_cpl-query
 
     dev:
         pip install --extra-index-url https://pip-dev.sh-edraft.de/ sh_cpl
         pip install --extra-index-url https://pip-dev.sh-edraft.de/ sh_cpl-cli
+        pip install --extra-index-url https://pip-dev.sh-edraft.de/ sh_cpl-query

scripts/build.sh

@@ -2,10 +2,14 @@
 # activate venv
 source /home/sven/Nextcloud_Sven/Schreibtisch/git_sh-edraft_de/sh_cpl/cpl-env/bin/activate
 
-# CLI
-cd /home/sven/Nextcloud_Sven/Schreibtisch/git_sh-edraft_de/sh_cpl/
-cpl build
-
 # CPL
 cd /home/sven/Nextcloud_Sven/Schreibtisch/git_sh-edraft_de/sh_cpl/src/cpl
+cpl build
+
+# CLI
+cd /home/sven/Nextcloud_Sven/Schreibtisch/git_sh-edraft_de/sh_cpl/src/cpl_cli
+cpl build
+
+# CPL Query
+cd /home/sven/Nextcloud_Sven/Schreibtisch/git_sh-edraft_de/sh_cpl/src/cpl_query
 cpl build

scripts/publish.sh

@@ -2,10 +2,14 @@
 # activate venv
 source /home/sven/Nextcloud_Sven/Schreibtisch/git_sh-edraft_de/sh_cpl/cpl-env/bin/activate
 
-# CLI
-cd /home/sven/Nextcloud_Sven/Schreibtisch/git_sh-edraft_de/sh_cpl/
-cpl publish
-
 # CPL
 cd /home/sven/Nextcloud_Sven/Schreibtisch/git_sh-edraft_de/sh_cpl/src/cpl
-cpl publish
+cpl publish
+
+# CLI
+cd /home/sven/Nextcloud_Sven/Schreibtisch/git_sh-edraft_de/sh_cpl/src/cpl_cli
+cpl publish
+
+# CPL Query
+cd /home/sven/Nextcloud_Sven/Schreibtisch/git_sh-edraft_de/sh_cpl/src/cpl_query
+cpl

src/cpl_cli/source_creator/console_builder.py

@@ -43,7 +43,8 @@ class ConsoleBuilder:
         ws_dict = {
             WorkspaceSettings.__name__: {
                 WorkspaceSettingsNameEnum.default_project.value: project_name,
-                WorkspaceSettingsNameEnum.projects.value: projects
+                WorkspaceSettingsNameEnum.projects.value: projects,
+                WorkspaceSettingsNameEnum.scripts: {}
             }
         }
 

src/cpl_cli/source_creator/library_builder.py

@@ -43,7 +43,8 @@ class LibraryBuilder:
         ws_dict = {
             WorkspaceSettings.__name__: {
                 WorkspaceSettingsNameEnum.default_project.value: project_name,
-                WorkspaceSettingsNameEnum.projects.value: projects
+                WorkspaceSettingsNameEnum.projects.value: projects,
+                WorkspaceSettingsNameEnum.scripts: {}
             }
         }
 

src/cpl_query/__init__.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+
+"""
+sh_cpl-query sh-edraft Common Python library Query
+~~~~~~~~~~~~~~~~~~~
+
+sh-edraft Common Python library Python integrated Queries
+
+:copyright: (c) 2020 - 2021 sh-edraft.de
+:license: MIT, see LICENSE for more details.
+
+"""
+
+__title__ = 'cpl_query'
+__author__ = 'Sven Heidemann'
+__license__ = 'MIT'
+__copyright__ = 'Copyright (c) 2020 - 2021 sh-edraft.de'
+__version__ = '2021.10.0rc1'
+
+from collections import namedtuple
+
+# imports: 
+
+VersionInfo = namedtuple('VersionInfo', 'major minor micro')
+version_info = VersionInfo(major='2021', minor='10', micro='0.rc1')

src/cpl_query/_extension/__init__.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+
+"""
+sh_cpl-query sh-edraft Common Python library Query
+~~~~~~~~~~~~~~~~~~~
+
+sh-edraft Common Python library Python integrated Queries
+
+:copyright: (c) 2020 - 2021 sh-edraft.de
+:license: MIT, see LICENSE for more details.
+
+"""
+
+__title__ = 'cpl_query._extension'
+__author__ = 'Sven Heidemann'
+__license__ = 'MIT'
+__copyright__ = 'Copyright (c) 2020 - 2021 sh-edraft.de'
+__version__ = '2021.10.0rc1'
+
+from collections import namedtuple
+
+# imports:
+
+VersionInfo = namedtuple('VersionInfo', 'major minor micro')
+version_info = VersionInfo(major='2021', minor='10', micro='0.rc1')

src/cpl_query/_extension/iterable.py

@@ -0,0 +1,115 @@
+from typing import Optional, Callable, Union
+
+from cpl_query.extension.ordered_iterable_abc import OrderedIterableABC
+from .._query.all import all_query
+from .._query.any import any_query
+from .._query.avg import avg_query
+from .._query.contains import contains_query
+from .._query.count import count_query
+from .._query.distinct import distinct_query
+from .._query.element_at import element_at_query, element_at_or_default_query
+from .._query.first_last import first_or_default_query, first_query, last_or_default_query, last_query
+from .._query.for_each import for_each_query
+from .._query.max_min import max_query, min_query
+from .._query.order_by import order_by_query, order_by_descending_query
+from .._query.reverse import reverse_query
+from .._query.single import single_query, single_or_default_query
+from .._query.skip_take import skip_query, skip_last_query, take_query, take_last_query
+from .._query.sum import sum_query
+from .._query.where import where_query
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+class Iterable(IterableABC):
+
+    def __init__(self, t: type = None, values: list = None):
+        IterableABC.__init__(self, t, values)
+
+    def any(self, func: Callable) -> bool:
+        return any_query(self, func)
+
+    def all(self, func: Callable) -> bool:
+        return all_query(self, func)
+
+    def average(self, func: Callable = None) -> Union[int, float, complex]:
+        return avg_query(self, func)
+
+    def contains(self, value: object) -> bool:
+        return contains_query(self, value)
+
+    def count(self, func: Callable = None) -> int:
+        return count_query(self, func)
+
+    def distinct(self, func: Callable) -> IterableABC:
+        return self.__to_self(distinct_query(self, func))
+
+    def element_at(self, index: int) -> any:
+        return element_at_query(self, index)
+
+    def element_at_or_default(self, index: int) -> Optional[any]:
+        return element_at_or_default_query(self, index)
+
+    def last(self) -> any:
+        return last_query(self)
+
+    def last_or_default(self) -> Optional[any]:
+        return last_or_default_query(self)
+
+    def first(self) -> any:
+        return first_query(self)
+
+    def first_or_default(self) -> Optional[any]:
+        return first_or_default_query(self)
+
+    def for_each(self, func: Callable):
+        for_each_query(self, func)
+
+    def max(self, func: Callable = None) -> Union[int, float, complex]:
+        return max_query(self, func)
+
+    def min(self, func: Callable = None) -> Union[int, float, complex]:
+        return min_query(self, func)
+
+    def order_by(self, func: Callable) -> OrderedIterableABC:
+        res = order_by_query(self, func)
+        from cpl_query._extension.ordered_iterable import OrderedIterable
+        res.__class__ = OrderedIterable
+        return res
+
+    def order_by_descending(self, func: Callable) -> OrderedIterableABC:
+        res = order_by_descending_query(self, func)
+        from cpl_query._extension.ordered_iterable import OrderedIterable
+        res.__class__ = OrderedIterable
+        return res
+
+    def reverse(self) -> IterableABC:
+        return reverse_query(self)
+
+    def single(self) -> any:
+        return single_query(self)
+
+    def single_or_default(self) -> Optional[any]:
+        return single_or_default_query(self)
+
+    def skip(self, index: int) -> IterableABC:
+        return self.__to_self(skip_query(self, index))
+
+    def skip_last(self, index: int) -> IterableABC:
+        return self.__to_self(skip_last_query(self, index))
+
+    def sum(self, func: Callable = None) -> Union[int, float, complex]:
+        return sum_query(self, func)
+
+    def take(self, index: int) -> IterableABC:
+        return self.__to_self(take_query(self, index))
+
+    def take_last(self, index: int) -> IterableABC:
+        return self.__to_self(take_last_query(self, index))
+
+    def where(self, func: Callable) -> IterableABC:
+        return self.__to_self(where_query(self, func))
+
+    @staticmethod
+    def __to_self(obj: IterableABC) -> IterableABC:
+        obj.__class__ = Iterable
+        return obj

src/cpl_query/_extension/ordered_iterable.py

@@ -0,0 +1,20 @@
+from collections import Callable
+
+from .iterable import Iterable
+from .._query.order_by import then_by_query, then_by_descending_query
+from cpl_query.extension.ordered_iterable_abc import OrderedIterableABC
+
+
+class OrderedIterable(Iterable, OrderedIterableABC):
+
+    def __init__(self):
+        Iterable.__init__(self)
+        OrderedIterableABC.__init__(self)
+
+    def then_by(self, _func: Callable) -> OrderedIterableABC:
+        self._funcs.append(_func)
+        return then_by_query(self, lambda *args: [f(*args) for f in self._funcs])
+
+    def then_by_descending(self, _func: Callable) -> OrderedIterableABC:
+        self._funcs.append(_func)
+        return then_by_descending_query(self, lambda *args: [f(*args) for f in self._funcs])

src/cpl_query/_helper.py

@@ -0,0 +1,2 @@
+def is_number(t: type) -> bool:
+    return issubclass(t, int) or issubclass(t, float) or issubclass(t, complex)

src/cpl_query/_query/__init__.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+
+"""
+sh_cpl-query sh-edraft Common Python library Query
+~~~~~~~~~~~~~~~~~~~
+
+sh-edraft Common Python library Python integrated Queries
+
+:copyright: (c) 2020 - 2021 sh-edraft.de
+:license: MIT, see LICENSE for more details.
+
+"""
+
+__title__ = 'cpl_query._query'
+__author__ = 'Sven Heidemann'
+__license__ = 'MIT'
+__copyright__ = 'Copyright (c) 2020 - 2021 sh-edraft.de'
+__version__ = '2021.10.0rc1'
+
+from collections import namedtuple
+
+# imports:
+
+VersionInfo = namedtuple('VersionInfo', 'major minor micro')
+version_info = VersionInfo(major='2021', minor='10', micro='0.rc1')

src/cpl_query/_query/all.py

@@ -0,0 +1,16 @@
+from collections import Callable
+
+from cpl_query._query.where import where_query
+from cpl_query.exceptions import ExceptionArgument, ArgumentNoneException
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def all_query(_list: IterableABC, _func: Callable) -> bool:
+    if _list is None:
+        raise ArgumentNoneException(ExceptionArgument.list)
+
+    if _func is None:
+        raise ArgumentNoneException(ExceptionArgument.func)
+
+    result = where_query(_list, _func)
+    return len(result) == len(_list)

src/cpl_query/_query/any.py

@@ -0,0 +1,16 @@
+from collections import Callable
+
+from cpl_query._query.where import where_query
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def any_query(_list: IterableABC, _func: Callable) -> bool:
+    if _list is None:
+        raise ArgumentNoneException(ExceptionArgument.list)
+
+    if _func is None:
+        raise ArgumentNoneException(ExceptionArgument.func)
+
+    result = where_query(_list, _func)
+    return len(result) > 0

src/cpl_query/_query/avg.py

@@ -0,0 +1,27 @@
+from typing import Callable, Union
+
+from cpl_query._helper import is_number
+from cpl_query.exceptions import InvalidTypeException, WrongTypeException, ExceptionArgument, ArgumentNoneException
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def avg_query(_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

src/cpl_query/_query/contains.py

@@ -0,0 +1,12 @@
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def contains_query(_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

src/cpl_query/_query/count.py

@@ -0,0 +1,15 @@
+from collections import Callable
+
+from cpl_query._query.where import where_query
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def count_query(_list: IterableABC, _func: Callable = None) -> int:
+    if _list is None:
+        raise ArgumentNoneException(ExceptionArgument.list)
+
+    if _func is None:
+        return len(_list)
+
+    return len(where_query(_list, _func))

src/cpl_query/_query/distinct.py

@@ -0,0 +1,24 @@
+from collections import Callable
+
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def distinct_query(_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

src/cpl_query/_query/element_at.py

@@ -0,0 +1,25 @@
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def element_at_query(_list: IterableABC, _index: int) -> any:
+    if _list is None:
+        raise ArgumentNoneException(ExceptionArgument.list)
+
+    if _index is None:
+        raise ArgumentNoneException(ExceptionArgument.index)
+
+    return _list[_index]
+
+
+def element_at_or_default_query(_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

src/cpl_query/_query/first_last.py

@@ -0,0 +1,44 @@
+from typing import Optional
+
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument, IndexOutOfRangeException
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def first_query(_list: IterableABC) -> any:
+    if _list is None:
+        raise ArgumentNoneException(ExceptionArgument.list)
+
+    if len(_list) == 0:
+        raise IndexOutOfRangeException()
+
+    return _list[0]
+
+
+def first_or_default_query(_list: IterableABC) -> Optional[any]:
+    if _list is None:
+        raise ArgumentNoneException(ExceptionArgument.list)
+
+    if len(_list) == 0:
+        return None
+
+    return _list[0]
+
+
+def last_query(_list: IterableABC) -> any:
+    if _list is None:
+        raise ArgumentNoneException(ExceptionArgument.list)
+
+    if len(_list) == 0:
+        raise IndexOutOfRangeException()
+
+    return _list[len(_list) - 1]
+
+
+def last_or_default_query(_list: IterableABC) -> Optional[any]:
+    if _list is None:
+        raise ArgumentNoneException(ExceptionArgument.list)
+
+    if len(_list) == 0:
+        return None
+
+    return _list[len(_list) - 1]

src/cpl_query/_query/for_each.py

@@ -0,0 +1,15 @@
+from collections import Callable
+
+from cpl_query.exceptions import ExceptionArgument, ArgumentNoneException
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def for_each_query(_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)

src/cpl_query/_query/max_min.py

@@ -0,0 +1,51 @@
+from collections import Callable
+from typing import Union
+
+from cpl_query._helper import is_number
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument, InvalidTypeException, WrongTypeException
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def max_query(_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
+
+
+def min_query(_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

src/cpl_query/_query/order_by.py

@@ -0,0 +1,47 @@
+from collections import Callable
+
+from cpl_query.exceptions import ExceptionArgument, ArgumentNoneException
+from cpl_query.extension.iterable_abc import IterableABC
+from cpl_query.extension.ordered_iterable_abc import OrderedIterableABC
+
+
+def order_by_query(_list: IterableABC, _func: Callable) -> OrderedIterableABC:
+    result = OrderedIterableABC(_func)
+    _list.sort(key=_func)
+    result.extend(_list)
+    return result
+
+
+def order_by_descending_query(_list: IterableABC, _func: Callable) -> OrderedIterableABC:
+    if _list is None:
+        raise ArgumentNoneException(ExceptionArgument.list)
+
+    if _func is None:
+        raise ArgumentNoneException(ExceptionArgument.func)
+
+    result = OrderedIterableABC(_func)
+    _list.sort(key=_func, reverse=True)
+    result.extend(_list)
+    return result
+
+
+def then_by_query(_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
+
+
+def then_by_descending_query(_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

src/cpl_query/_query/reverse.py

@@ -0,0 +1,15 @@
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def reverse_query(_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

src/cpl_query/_query/single.py

@@ -0,0 +1,28 @@
+from typing import Optional
+
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def single_query(_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]
+
+
+def single_or_default_query(_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]

src/cpl_query/_query/skip_take.py

@@ -0,0 +1,66 @@
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument, IndexOutOfRangeException
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def skip_query(_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
+
+
+def skip_last_query(_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
+
+
+def take_query(_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
+
+
+def take_last_query(_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

src/cpl_query/_query/sum.py

@@ -0,0 +1,25 @@
+from collections import Callable
+from typing import Union
+
+from cpl_query._helper import is_number
+from cpl_query.exceptions import ExceptionArgument, ArgumentNoneException, InvalidTypeException
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def sum_query(_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

src/cpl_query/_query/where.py

@@ -0,0 +1,19 @@
+from collections import Callable
+
+from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def where_query(_list: IterableABC, _func: Callable) -> IterableABC:
+    if _list is None:
+        raise ArgumentNoneException(ExceptionArgument.list)
+
+    if _func is None:
+        raise ArgumentNoneException(ExceptionArgument.func)
+
+    result = IterableABC()
+    for element in _list:
+        if _func(element):
+            result.append(element)
+
+    return result

src/cpl_query/cpl_query.json

@@ -0,0 +1,41 @@
+{
+  "ProjectSettings": {
+    "Name": "sh_cpl-query",
+    "Version": {
+      "Major": "2021",
+      "Minor": "10",
+      "Micro": "0.rc1"
+    },
+    "Author": "Sven Heidemann",
+    "AuthorEmail": "sven.heidemann@sh-edraft.de",
+    "Description": "sh-edraft Common Python library Query",
+    "LongDescription": "sh-edraft Common Python library Python integrated Queries",
+    "URL": "https://www.sh-edraft.de",
+    "CopyrightDate": "2020 - 2021",
+    "CopyrightName": "sh-edraft.de",
+    "LicenseName": "MIT",
+    "LicenseDescription": "MIT, see LICENSE for more details.",
+    "Dependencies": [
+      "sh_cpl==2021.4.0.post1"
+    ],
+    "PythonVersion": ">=3.9.2",
+    "PythonPath": {},
+    "Classifiers": []
+  },
+  "BuildSettings": {
+    "ProjectType": "library",
+    "SourcePath": "",
+    "OutputPath": "../../dist",
+    "Main": "",
+    "EntryPoint": "",
+    "IncludePackageData": true,
+    "Included": [],
+    "Excluded": [
+      "*/__pycache__",
+      "*/logs",
+      "*/tests"
+    ],
+    "PackageData": {},
+    "ProjectReferences": []
+  }
+}

src/cpl_query/exceptions.py

@@ -0,0 +1,31 @@
+from enum import Enum
+
+
+# models
+class ExceptionArgument(Enum):
+    list = 'list'
+    func = 'func'
+    type = 'type'
+    value = 'value'
+    index = 'index'
+
+
+# exceptions
+class ArgumentNoneException(Exception):
+
+    def __init__(self, arg: ExceptionArgument):
+        Exception.__init__(self, f'argument {arg} is None')
+
+
+class IndexOutOfRangeException(Exception):
+
+    def __init__(self):
+        Exception.__init__(self, f'List index out of range')
+
+
+class InvalidTypeException(Exception):
+    pass
+
+
+class WrongTypeException(Exception):
+    pass

src/cpl_query/extension/__init__.py

@@ -0,0 +1,25 @@
+# -*- coding: utf-8 -*-
+
+"""
+sh_cpl-query sh-edraft Common Python library Query
+~~~~~~~~~~~~~~~~~~~
+
+sh-edraft Common Python library Python integrated Queries
+
+:copyright: (c) 2020 - 2021 sh-edraft.de
+:license: MIT, see LICENSE for more details.
+
+"""
+
+__title__ = 'cpl_query.extension'
+__author__ = 'Sven Heidemann'
+__license__ = 'MIT'
+__copyright__ = 'Copyright (c) 2020 - 2021 sh-edraft.de'
+__version__ = '2021.10.0rc1'
+
+from collections import namedtuple
+
+# imports:
+
+VersionInfo = namedtuple('VersionInfo', 'major minor micro')
+version_info = VersionInfo(major='2021', minor='10', micro='0.rc1')

src/cpl_query/extension/iterable_abc.py

@@ -0,0 +1,115 @@
+from abc import ABC, abstractmethod
+from typing import Optional, Callable, Union, Iterable
+
+
+class IterableABC(ABC, list):
+
+    @abstractmethod
+    def __init__(self, t: type = None, values: list = None):
+        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 any(self, func: Callable) -> bool: pass
+
+    @abstractmethod
+    def all(self, func: Callable) -> bool: pass
+
+    def append(self, __object: object) -> None:
+        if self._type is not None and type(__object) != self._type and not isinstance(type(__object), self._type):
+            raise Exception(f'Unexpected type: {type(__object)}')
+
+        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]: pass
+
+    @abstractmethod
+    def contains(self, value: object) -> bool: pass
+
+    @abstractmethod
+    def count(self, func: Callable) -> int: pass
+
+    @abstractmethod
+    def distinct(self, func: Callable) -> 'IterableABC': pass
+
+    @abstractmethod
+    def element_at(self, index: int) -> any: pass
+
+    @abstractmethod
+    def element_at_or_default(self, index: int) -> Optional[any]: pass
+
+    def extend(self, __iterable: Iterable) -> None:
+        for value in __iterable:
+            self.append(value)
+
+    @abstractmethod
+    def last(self) -> any: pass
+
+    @abstractmethod
+    def last_or_default(self) -> any: pass
+
+    @abstractmethod
+    def first(self) -> any: pass
+
+    @abstractmethod
+    def first_or_default(self) -> any: pass
+
+    @abstractmethod
+    def for_each(self, func: Callable) -> Union[int, float, complex]: pass
+
+    @abstractmethod
+    def max(self, func: Callable = None) -> Union[int, float, complex]: pass
+
+    @abstractmethod
+    def min(self, func: Callable = None) -> Union[int, float, complex]: pass
+
+    @abstractmethod
+    def order_by(self, func: Callable) -> 'IterableABC': pass
+
+    @abstractmethod
+    def order_by_descending(self, func: Callable) -> 'IterableABC': pass
+
+    @abstractmethod
+    def reverse(self) -> 'IterableABC': pass
+
+    @abstractmethod
+    def single(self) -> any: pass
+
+    @abstractmethod
+    def single_or_default(self) -> Optional[any]: pass
+
+    @abstractmethod
+    def skip(self, index: int) -> 'IterableABC': pass
+
+    @abstractmethod
+    def skip_last(self, index: int) -> 'IterableABC': pass
+
+    @abstractmethod
+    def sum(self, func: Callable = None) -> Union[int, float, complex]: pass
+
+    @abstractmethod
+    def take(self, index: int) -> 'IterableABC': pass
+
+    @abstractmethod
+    def take_last(self, index: int) -> 'IterableABC': pass
+
+    def to_list(self) -> list:
+        return list(self)
+
+    @abstractmethod
+    def where(self, func: Callable) -> 'IterableABC': pass

src/cpl_query/extension/list.py

@@ -0,0 +1,7 @@
+from .._extension.iterable import Iterable
+
+
+class List(Iterable):
+
+    def __init__(self, t: type = None, values: list = None):
+        Iterable.__init__(self, t, values)

src/cpl_query/extension/ordered_iterable_abc.py

@@ -0,0 +1,20 @@
+from abc import abstractmethod
+from collections import Callable
+
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+class OrderedIterableABC(IterableABC):
+
+    @abstractmethod
+    def __init__(self, _func: Callable = None):
+        IterableABC.__init__(self)
+        self._funcs: list[Callable] = []
+        if _func is not None:
+            self._funcs.append(_func)
+
+    @abstractmethod
+    def then_by(self, func: Callable) -> 'OrderedIterableABC': pass
+
+    @abstractmethod
+    def then_by_descending(self, func: Callable) -> 'OrderedIterableABC': pass

src/cpl_query/tests/iterable_test.py

@@ -0,0 +1,21 @@
+import unittest
+
+from cpl_query.extension.list import List
+
+
+class IterableTest(unittest.TestCase):
+
+    def setUp(self) -> None:
+        self._list = List(int)
+
+    def _clear(self):
+        self._list.clear()
+        self.assertEqual(self._list, [])
+
+    def test_append(self):
+        self._list.append(1)
+        self._list.append(2)
+        self._list.append(3)
+
+        self.assertEqual(self._list, [1, 2, 3])
+        self.assertRaises(Exception, lambda v: self._list.append(v), '3')

src/cpl_query/tests/models.py

@@ -0,0 +1,12 @@
+class User:
+
+    def __init__(self, name, address):
+        self.name = name
+        self.address = address
+
+
+class Address:
+
+    def __init__(self, street, nr):
+        self.street = street
+        self.nr = nr

src/cpl_query/tests/query_test.py

@@ -0,0 +1,314 @@
+import string
+import unittest
+from random import randint
+
+from cpl.utils import String
+from cpl_query.exceptions import InvalidTypeException, ArgumentNoneException
+from cpl_query.extension.list import List
+from cpl_query.tests.models import User, Address
+
+
+class QueryTest(unittest.TestCase):
+
+    def setUp(self) -> None:
+        self._tests = List(User)
+        self._t_user = User(
+            'Test user',
+            Address(
+                'teststr.',
+                15
+            )
+        )
+
+        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.append(user)
+
+        self._tests.append(self._t_user)
+
+    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 = List(str, ['hello', 'world'])
+            e_res = tests.average()
+
+        self.assertRaises(InvalidTypeException, invalid)
+
+        tests = List(int, list(range(0, 100)))
+        self.assertEqual(sum(tests) / len(tests), tests.average())
+
+        def wrong2():
+            tests2 = List(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[index], self._tests.element_at(index))
+
+    def test_element_at_or_default(self):
+        index = randint(0, len(self._tests) - 1)
+        self.assertEqual(self._tests[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[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[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[0], s_res)
+
+    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[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(self._t_user.address.nr, res)
+
+        tests = List(values=list(range(0, 100)))
+        self.assertEqual(99, tests.max())
+
+        def invalid():
+            tests = List(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 = List(values=list(range(0, 100)))
+        self.assertEqual(0, tests.min())
+
+        def invalid():
+            tests = List(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)
+        s_res = self._tests
+        s_res.sort(key=lambda user: user.address.street)
+
+        self.assertEqual(res, s_res)
+        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)
+        res2 = self._tests.order_by_descending(lambda user: user.address.nr)
+        s_res = self._tests
+        s_res.sort(key=lambda user: user.address.street, reverse=True)
+
+        self.assertEqual(res, s_res)
+        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)
+
+        s_res = self._tests
+        s_res.sort(key=lambda user: (user.address.street[0], 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(
+            lambda user: user.address.nr)
+
+        s_res = self._tests
+        s_res.sort(key=lambda user: (user.address.street[0], user.address.nr), reverse=True)
+
+        self.assertEqual(res, s_res)
+
+    def test_reverse(self):
+        res = self._tests.reverse()
+        l_res = self._tests.to_list()
+        l_res.reverse()
+
+        self.assertEqual(l_res, res)
+
+    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)
+
+        self.assertEqual(len(self._tests) - 5, len(skipped))
+        self.assertEqual(self._tests[5:], skipped)
+
+    def test_skip_last(self):
+        skipped = self._tests.skip_last(5)
+
+        self.assertEqual(len(self._tests) - 5, len(skipped))
+        self.assertEqual(self._tests[:-5], skipped)
+        self.assertEqual(self._tests[:-5][len(self._tests[:-5]) - 1], skipped.last())
+
+    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 = List(values=list(range(0, 100)))
+        self.assertEqual(0, tests.min())
+
+        def invalid():
+            tests2 = List(str, ['hello', 'world'])
+            e_res = tests2.average()
+
+        self.assertRaises(InvalidTypeException, invalid)
+
+    def test_take(self):
+        skipped = self._tests.take(5)
+
+        self.assertEqual(5, len(skipped))
+        self.assertEqual(self._tests[:5], skipped)
+
+    def test_take_last(self):
+        skipped = self._tests.take_last(5)
+
+        self.assertEqual(5, len(skipped))
+        self.assertEqual(self._tests[-5:], skipped)
+        self.assertEqual(self._tests[len(self._tests) - 1], skipped.last())
+
+    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)

src/cpl_query/tests/tester.py

@@ -0,0 +1,25 @@
+import unittest
+
+from cpl_query.tests.iterable_test import IterableTest
+from cpl_query.tests.query_test import QueryTest
+
+
+class Tester:
+
+    def __init__(self):
+        self._suite = unittest.TestSuite()
+
+    def create(self):
+        loader = unittest.TestLoader()
+        self._suite.addTests(loader.loadTestsFromTestCase(QueryTest))
+        self._suite.addTests(loader.loadTestsFromTestCase(IterableTest))
+
+    def start(self):
+        runner = unittest.TextTestRunner()
+        runner.run(self._suite)
+
+
+if __name__ == '__main__':
+    tester = Tester()
+    tester.create()
+    tester.start()