'''     用来匹配邮箱地址是否符合规范 ''' import re while True:     email_addr = input('请输入您的邮箱地址：')     email_addr = re.match(r'\d+@[0-9a-zA-Z]+\.com$', email_addr)     if email_addr:         print('您的邮箱是:{}'.format(email_addr.group()))         exit()     else:         print('邮箱格式有误')