【foo.py】
代码语言：javascript复制# encoding: utf-8
# author: walker
# date: 2019-07-15
# summary: 一种正则和 lambda 的有趣结合
import re
dic = {'user': 'walker', 'domain': '163.com'}
rule = r'%user%@%domain%'
email = re.sub('%[^%]*%', lambda matchobj: dic[matchobj.group(0).strip('%')], rule)
print('email: %s' % email) # walker@163.com
