Python2とPython3の継承、違い

2018/3/9 Pythonお役立ちTips

Python2

>>> class ParentClass(object):
...     def foo(self):
...         print "call parent"
...
>>> class ChildClass(ParentClass):
...     def foo(self):
...         super(ChildClass, self).foo()
...         print "call child"
...
>>> p = ParentClass()
>>> c = ChildClass()
>>> p.foo()
call parent
>>> c.foo()
call parent
call child

>>> class ParentClass(object):

... def foo(self):

... print "call parent"

...

>>> class ChildClass(ParentClass):

... def foo(self):

... super(ChildClass, self).foo()

... print "call child"

...

>>> p = ParentClass()

>>> c = ChildClass()

>>> p.foo()

call parent

>>> c.foo()

call parent

call child

Python3

>>> class ParentClass(object):
...     def foo(self):
...         print("call parent")
...
>>> class ChildClass(ParentClass):
...     def foo(self):
...         super().foo()  # super()だけで良い。シンプル
...         print("call child")
...
>>> p = ParentClass()
>>> c = ChildClass()
>>> p.foo()
call parent
>>> c.foo()
call parent
call child

>>> class ParentClass(object):

... def foo(self):

... print("call parent")

...

>>> class ChildClass(ParentClass):

... def foo(self):

... super().foo() # super()だけで良い。シンプル

... print("call child")

...

>>> p = ParentClass()

>>> c = ChildClass()

>>> p.foo()

call parent

>>> c.foo()

call parent

call child