Mixin

>>> class Upper:
...     def uppercase(self, value):
...             print(value.upper())
... 
>>> u = Upper()
>>> u.uppercase('hi')
HI
>>> class DashUpper(Upper):
...     def uppercase(self, value):
...             value = f'--{value}--'
...             super().uppercase(value)
... 
>>> d = DashUpper()
>>> d.uppercase('hi')
--HI--
>>> 
>>> class DashMixin:
...     def uppercase(self, value):
...             value = f'--{value}--'
...             super().uppercase(value)
... 
>>> class DashUpperNew(DashMixin, Upper):
...     pass
... 
>>> dm = DashUpperNew()
>>> dm.uppercase('hi')
--HI--





>>> class Name:
...     def __init__(self, name):
...             self.name = name
... 
>>> class UpperNameMixin:
...     def upper(self):
...             print(self.name.upper())
... 
>>> class UpperName(UpperNameMixin, Name):
...     pass
... 
>>> c = UpperName('bob')
>>>
>>> c.name
'bob'
>>> c.upper()
BOB



>>> class UpperName2(UpperNameMixin, Name):
...     def uppername(self):
...             print(self.name.upper())
... 
>>> c = UpperName2('bob')
>>> c.upper()
BOB
>>> c.uppername()
BOB
>>> class Name2(UpperNameMixin):
...     def __init__(self, name):
...             self.name = name
... 
>>> b = Name2('blue')
>>> b.upper()
BLUE
>>>