python meta_class_experiment.py

Posted 2021-05-09

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#!/usr/bin/env python
# coding: utf-8


class MetaHandler(type):
    def __new__(mcs, name, bases, attrs):
        instance = type.__new__(mcs, name, bases, attrs)
        if hasattr(instance, 'get'):
            sub_get = getattr(instance, 'get')

            def get(self):
                sub_get(self)
                print('I am static get')

            setattr(instance, 'get', get)
        return instance


class BaseHandler(object):
    __metaclass__ = MetaHandler


# noinspection PyMethodMayBeStatic,PyMethodMayBeStatic
class SubHandler(BaseHandler):
    def get(self):
        print 'SubHandler.get'


def main():
    """
    :return:
    SubHandler.get
    I am static get
    """
    sh = SubHandler()
    sh.get()


if __name__ == '__main__':
    main()

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