在 Python 中调用基类方法

Calling base class method in Python

提问by user225312

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

我有两个类 A 和 B，A 是 B 的基类。

I read that all methods in Python are virtual.

我读到 Python 中的所有方法都是虚拟的。

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?

那么如何调用基类的方法，因为当我尝试调用它时，派生类的方法会按预期调用？

>>> 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 ???

采纳答案by user225312

Using super:

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

回答by primroot

Two ways:

两种方式：

>>> A.print_it(x)
'A'
>>> super(B, x).print_it()
'A'