auto save

diy2.py

@@ -6,8 +6,8 @@ while True:
     if a == username and b == userpassword:
     if a == username and b == userpassword:
         print("登录成功!")
         print("登录成功!")
         break
         break
-    if username!=a:  
+    elif username!=a:  
         print("用户名错误!请重新输入")
         print("用户名错误!请重新输入")
-    if userpassword!=b:
+    else:
         print("密码错误!请重新输入")
         print("密码错误!请重新输入")
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
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