common 模块的 context.py

1.context.py  是写正则表达式的，源码如下：

import re
#s 是目标字符串
#dict 是替换的内容
#找到目标字符串里面的标识符KEY，去d里面拿到替换的值
#替换到s 里面去，然后仔返回

def replace(s,dict):
    p = "\$\{(.*?)}"
    while re.search(p,s) is not None:
        m = re.search(p,s)
        key = m.group(1)
        value = dict[key]
        s = re.sub(p,value,s,count=1)
    return s

s = '{"mobilephone":"${admin_user}","pwd":"${admin_pwd}"}'
data = {"admin_user":"17799801359","admin_pwd":"123456"}

s = replace(s,data)
print(s)