auto save

diy2.py

-i = 0
-username = "python"
-userpassword = "123456"
-while True:
-    if i <= 3:
-        name = input("请输入用户名:")
-        password = input("请输入密码:")
-        if name == username and password == userpassword:
-            print("登录成功!")
-            break
-        elif name != username:
-            print("用户名错误")
-            continue
-        elif password != userpassword:
-            print("密码错误")
-    else:
-        print("有内鬼终止交易")
-        exit()
-print("欢迎来到贝尔编程!")
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