Added queries sum, skip & take

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