在Python中调用基类方法 [英] Calling base class method in Python

问题描述

我有两个类A和B，A是B的基类。

I have two classes A and B and A is base class of B.

我读到Python中的所有方法都是虚拟的。

I read that all methods in Python are virtual.

那么我如何调用基类的方法，因为当我尝试调用基类的方法时，派生类的方法被按预期方式调用了？
$ b

So how do I call a method of the base because when I try to call it, the method of the derived class is called as expected?

>>> class A(object):
    def print_it(self):
        print 'A'


>>> class B(A):
    def print_it(self):
        print 'B'


>>> x = B()
>>> x.print_it()
B
>>> x.A ???

推荐答案

使用超级：

>>> class A(object):
...     def print_it(self):
...             print 'A'
... 
>>> class B(A):
...     def print_it(self):
...             print 'B'
... 
>>> x = B()
>>> x.print_it()                # calls derived class method as expected
B
>>> super(B, x).print_it()      # calls base class method
A

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