Python-сообщество

 class A():
    def foo(self):
       print('object method')
    @classmethod
    def foo(cls):
       print('class method')
    @staticmethod
    def foo():
       print('static method')
obj = A()
obj.foo()
static method
A.foo()
static method

 >>> class A:
...     def foo(self):
...        print('object method', type(self))
...
>>>
>>> class B:
...     @classmethod
...     def foo(cls):
...        print('class method', type(cls))
...
>>>
>>> class C:
...     @staticmethod
...     def foo():
...        print('static method')
...
>>>
>>>
>>>
>>>
>>>
>>>
>>> A().foo()
object method <class '__main__.A'>
>>> A.foo()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: foo() missing 1 required positional argument: 'self'
>>>
>>>
>>>
>>> B().foo()
class method <class 'type'>
>>> B.foo()
class method <class 'type'>
>>>
>>>
>>>
>>> C().foo()
static method
>>> C.foo()
static method