auto save

diy2.py

-u= "p"
-s= "123456"
-while True:
-    n = input("请输入用户名:")
-    p= input("请输入密码:")
-    if n == u and p == s:
-        print("登录成功!")
-        break
-    elif n!=u:
-        print("用户不存在,请重新输入!")
-    else:
-        print("密码错误,请重新输入!")    
-print("欢迎来到贝尔编程!")
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