auto save

diy2.py

-username="python"
-userpassword="123456"
+username = "python"
+userpassword = "123456"
 while True:
-    a=input("请输入账号:")
-    b=input("请输入密码:")
-    if a==username and b==userpassword: 
-        print("登陆成功")
-    else:
-        print("登陆失败")
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+    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
+    print("用户名和密码错误!请重新输入")
+print("欢迎来到贝尔编程!")
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