如何在 Python 中调用超级构造函数? [英] How to invoke the super constructor in Python?

问题描述

class A:
    def __init__(self):
        print("world")

class B(A):
    def __init__(self):
       print("hello")

B()  # output: hello

在我使用过的所有其他语言中，超级构造函数是隐式调用的.如何在 Python 中调用它?我希望 super(self) 但这不起作用.

In all other languages I've worked with the super constructor is invoked implicitly. How does one invoke it in Python? I would expect super(self) but this doesn't work.

推荐答案

与其他答案一致，有多种方法可以调用超类方法(包括构造函数)，但是在 Python-3.x 中该过程已简化:

In line with the other answers, there are multiple ways to call super class methods (including the constructor), however in Python-3.x the process has been simplified:

Python-2.x

class A(object):
 def __init__(self):
   print "world"

class B(A):
 def __init__(self):
   print "hello"
   super(B, self).__init__()

Python-3.x

class A(object):
 def __init__(self):
   print("world")

class B(A):
 def __init__(self):
   print("hello")
   super().__init__()

super() 现在等同于 super(<包含类名>, self) 根据 文档.

super() is now equivalent to super(<containing classname>, self) as per the docs.

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