Added different queries & unittests

src/cpl_query/_query/any_query.py

@@ -0,0 +1,7 @@
+from cpl_query._query.where_query import where_query
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def any_query(_list: IterableABC, _func: str) -> bool:
+    result = where_query(_list, _func)
+    return len(result) > 0

src/cpl_query/_query/first_query.py

@@ -0,0 +1,17 @@
+from typing import Optional
+
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def first_query(_list: IterableABC) -> any:
+    if len(_list) == 0:
+        raise Exception('Index out of range')
+
+    return _list[0]
+
+
+def first_or_default_query(_list: IterableABC) -> Optional[any]:
+    if len(_list) == 0:
+        return None
+
+    return _list[0]

src/cpl_query/_query/for_each_query.py

@@ -0,0 +1,8 @@
+from collections import Callable
+
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def for_each_query(_list: IterableABC, func: Callable):
+    for element in _list:
+        func(element)

src/cpl_query/_query/single_query.py

@@ -0,0 +1,21 @@
+from typing import Optional
+
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def single_query(_list: IterableABC) -> any:
+    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 len(_list) > 1:
+        raise Exception('Index out of range')
+    elif len(_list) == 0:
+        return None
+
+    return _list[0]

src/cpl_query/_query/where_query.py

@@ -0,0 +1,13 @@
+from cpl_query.extension.iterable_abc import IterableABC
+
+
+def where_query(_list: IterableABC, _func: str) -> IterableABC:
+    result = IterableABC()
+    for element in _list:
+        element_type = type(element).__name__
+        if element_type in _func:
+            func = _func.replace(element_type, 'element')
+            if eval(func):
+                result.append(element)
+
+    return result