src/cpl_query/_extension/iterable.py

@@ -64,11 +64,11 @@ class Iterable(IterableABC):
     def for_each(self, func: Callable):
         for_each_query(self, func)
 
-    def max(self, t: type, func: Callable) -> Union[int, float, complex]:
+    def max(self, func: Callable) -> Union[int, float, complex]:
-        return max_query(self, t, func)
+        return max_query(self, func)
 
-    def min(self, t: type, func: Callable) -> Union[int, float, complex]:
+    def min(self, func: Callable) -> Union[int, float, complex]:
-        return min_query(self, t, func)
+        return min_query(self, func)
 
     def order_by(self, func: Callable) -> OrderedIterableABC:
         res = order_by_query(self, func)

src/cpl_query/_query/avg.py

@@ -19,7 +19,7 @@ def avg_query(_list: IterableABC, _func: Callable) -> Union[int, float, complex]
         else:
             value = element
 
-        if _list.type is not None and type(element) != _list.type or not is_number(type(value)):
+        if _func is None and type(element) != _list.type or not is_number(type(value)):
             raise WrongTypeException()
 
         average += value

src/cpl_query/_query/max_min.py

@@ -1,43 +1,46 @@
 from collections import Callable
 from typing import Union
 
-from cpl_query.exceptions import ArgumentNoneException, ExceptionArgument, InvalidTypeException
+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, _t: type, _func: Callable) -> Union[int, float, complex]:
+def max_query(_list: IterableABC, _func: Callable) -> Union[int, float, complex]:
     if _list is None:
         raise ArgumentNoneException(ExceptionArgument.list)
 
-    if _func is None:
+    max_value = 0
-        raise ArgumentNoneException(ExceptionArgument.func)
-
-    if _t != int and _t != float and _t != complex:
-        raise InvalidTypeException()
-
-    max_value = _t()
     for element in _list:
+        if _func is not None:
             value = _func(element)
+        else:
+            value = element
+
+        if _func is None and type(value) != _list.type or not is_number(type(value)):
+            raise WrongTypeException()
+
         if value > max_value:
             max_value = value
 
     return max_value
 
 
-def min_query(_list: IterableABC, _t: type, _func: Callable) -> Union[int, float, complex]:
+def min_query(_list: IterableABC, _func: Callable) -> Union[int, float, complex]:
     if _list is None:
         raise ArgumentNoneException(ExceptionArgument.list)
 
-    if _func is None:
+    min_value = 0
-        raise ArgumentNoneException(ExceptionArgument.func)
-
-    if _t != int and _t != float and _t != complex:
-        raise InvalidTypeException()
-
-    min_value = _t()
     is_first = True
     for element in _list:
+        if _func is not None:
             value = _func(element)
+        else:
+            value = element
+
+        if _func is None and type(value) != _list.type or not is_number(type(value)):
+            raise WrongTypeException()
+
         if is_first:
             min_value = value
             is_first = False

src/cpl_query/extension/iterable_abc.py

@@ -30,6 +30,9 @@ class IterableABC(ABC, list):
         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
@@ -66,7 +69,10 @@ class IterableABC(ABC, list):
     def for_each(self, func: Callable) -> Union[int, float, complex]: pass
 
     @abstractmethod
-    def max(self, t: type, func: Callable) -> Union[int, float, complex]: pass
+    def max(self, func: Callable) -> Union[int, float, complex]: pass
+
+    @abstractmethod
+    def min(self, func: Callable) -> Union[int, float, complex]: pass
 
     @abstractmethod
     def order_by(self, func: Callable) -> 'IterableABC': pass

src/cpl_query/tests/query_test.py

@@ -168,11 +168,11 @@ class QueryTest(unittest.TestCase):
         self.assertEqual(len(users), len(self._tests))
 
     def test_max(self):
-        res = self._tests.max(int, lambda u: u.address.nr)
+        res = self._tests.max(lambda u: u.address.nr)
         self.assertEqual(self._t_user.address.nr, res)
 
     def test_min(self):
-        res = self._tests.min(int, lambda u: u.address.nr)
+        res = self._tests.min(lambda u: u.address.nr)
         self.assertEqual(1, res)
 
     def test_order_by(self):