如何扩展一个类在python？ [英] How to extend a class in python?

问题描述

在python中如何扩展类？例如，如果我有

In python how can you extend a class? For example if I have

color.py

class Color:
    def __init__(self, color):
        self.color = color
    def getcolor(self):
        return self.color

color_extended.py

color_extended.py

import Color

class Color:
    def getcolor(self):
        return self.color + " extended!"

但这不工作...
我希望如果我在 color_extended.py ，那么当我创建一个颜色对象并使用 getcolor 函数时，它将返回带有字符串的对象扩展！到底。

But this doesn't work... I expect that if I work in color_extended.py, then when I make a color object and use the getcolor function then it will return the object with the string " extended!" in the end. Also it should have gotton the init from the import.

假设python 3.1

Assume python 3.1

感谢

推荐答案

使用：

import color

class Color(color.Color):
    ...

如果这是Python 2.x，你还需要从对象中派生 color.Color 新式类：

If this were Python 2.x, you would also want to derive color.Color from object, to make it a new-style class:

class Color(object):
    ...

这在Python 3.x中不是必需的。

This is not necessary in Python 3.x.

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