super()创建有序字典

super()创建有序字典

#!/usr/bin/env python
# -*- coding:utf-8 -*-
# 有序的字典


class MyDict(dict):

    def __init__(self):
        self.li = []
        super(MyDict,self).__init__()

    def __setitem__(self, key, value):
        self.li.append(key)
        super(MyDict,self).__setitem__(key,value)

    def __str__(self):
        temp_list = []
        for key in self.li:
            value = self.get(key)
            temp_list.append("'%s':%s" %(key,value))
        temp_str = "{" + ",".join(temp_list) + "}"

        return temp_str

obj = MyDict()
obj['k1'] = 123
obj['k2'] = 456
print(obj)