Python：在运行时更改方法和属性

Question

我希望在Python中创建一个可以添加和删除属性和方法的类。我该如何完成？哦，请不要问为什么。

Answer 1

我希望在Python中创建一个可以添加和删除属性和方法的类。

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'