auto save

diy4.py

@@ -6,8 +6,9 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    elif name != username:
-        print("用户名不存在，请重新输入!")
-    else:
-        print("密码有误，请重新输入!")
+    if name != username:
+        print("用户名不存在，请重新输入！")
+        continue
+    if password != userpassword:
+        print("用户密码不正确，请重新输入！")
 print("欢迎来到贝尔编程!")
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