# -*- coding: utf-8 -*-

def globalvar_init():#初始化
    global _global_dict
    _global_dict = {}
 
def set_globalvar_value(key,value):
    """ 定义一个全局变量 """
    _global_dict[key] = value

def get_globalvar_value(key):
    """ 获得一个全局变量,不存在则返回默认值 """
    try:
        return _global_dict[key]
    except KeyError:
        return None