auto save

diy1.py

@@ -6,5 +6,9 @@ while True:
     if name == username and password == userpassword:
          print("登录成功")
          break
-    print("用户名和密码错误！！！")
+    if name != username:
+        print("用户名不存在")
+        continue
+    if password != userpassword:
+        print("密码输入有误")
 print("欢迎来到贝尔编程")# 如果用户输入的账号、密码正确，提示登陆成功
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