auto save

diy2.py

@@ -6,10 +6,9 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if name != username:    
-        print("重新输入用户名")
-        continue
-    if password != userpassword:    
+    elif name != username:    
         print("重新输入用户名")
+    else:    
+        print("重新输入密码")
 print("欢迎来到贝尔编程")
   
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