python利用字典實現全局變量

1、創建一個字典用於保存變量
# dict
import collections


class GlobalDict(collections.UserDict):
 """使用繼承UserDict"""

 def __missing__(self, key):
 """獲取不存在的值時"""
 return None


my_dict = GlobalDict()

2、引用my_dict 保存全局變量

# global_dict
from dict import my_dict


my_dict['key1'] = 1
my_dict['key2'] = 2

3、使用my_dict作為全局變量的字典

from global_dict import my_dict

print(my_dict)