auto save

2.py

-username="python"
-userpassword = "12345" 
-while True: 
-    name=input("请输入账号")
-    password=input("请输入密码")
-    if username==name and userpassword==password:
-        print("登陆成功!")
-        break
-    if name!=username:
-        print("用户名不存在请重新输入")
-    if password!=userpassword:
-        print("密码错误请重新输入")
-print("欢迎来到贝尔编程!")
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