Python 使用其他类的方法 [英] Python using methods from other classes

问题描述

如果我有两个类，其中一个类有一个我想在另一个类中使用的函数，我应该用什么来避免重写我的函数?

If I have two classes, and one of them has a function that I want to use in my other class, what do I use so that I don't have to rewrite my function?

推荐答案

有两个选项:

• 在类中实例化一个对象，然后在其上调用所需的方法
• 使用 @classmethod 将函数变成类方法

• instanciate an object in your class, then call the desired method on it
• use @classmethod to turn a function into a class method

示例:

class A(object):
    def a1(self):
        """ This is an instance method. """
        print "Hello from an instance of A"

    @classmethod
    def a2(cls):
        """ This a classmethod. """
        print "Hello from class A"

class B(object):
    def b1(self):
        print A().a1() # => prints 'Hello from an instance of A'
        print A.a2() # => 'Hello from class A'

或者使用继承，如果合适的话:

Or use inheritance, if appropriate:

class A(object):
    def a1(self):
        print "Hello from Superclass"

class B(A):
    pass

B().a1() # => prints 'Hello from Superclass'

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