Python:在运行时更改方法和属性 [英] Python: changing methods and attributes at runtime

问题描述

我希望在 Python 中创建一个可以添加和删除属性和方法的类.我怎样才能做到这一点?

I wish to create a class in Python that I can add and remove attributes and methods. How can I acomplish that?

哦，请不要问为什么.

推荐答案

我希望在 Python 中创建一个可以添加和删除属性和方法的类.

I wish to create a class in Python that I can add and remove attributes and methods.

import types

class SpecialClass(object):
    @classmethod
    def removeVariable(cls, name):
        return delattr(cls, name)

    @classmethod
    def addMethod(cls, func):
        return setattr(cls, func.__name__, types.MethodType(func, cls))

def hello(self, n):
    print n

instance = SpecialClass()
SpecialClass.addMethod(hello)

>>> SpecialClass.hello(5)
5

>>> instance.hello(6)
6

>>> SpecialClass.removeVariable("hello")

>>> instance.hello(7)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'SpecialClass' object has no attribute 'hello'

>>> SpecialClass.hello(8)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: type object 'SpecialClass' has no attribute 'hello'

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