save project

diy1.py

@@ -5,7 +5,11 @@ white Ture:
     password=input("请输入密码：")
     if name == username and password == userpassword:
         print("登陆成功")
-    print("用户名和密码错误！请重新输入")
+        break
+    if name!=username:
+        print("用户名不存在，请重新输入！")
+    if password!=userpassword
+        print("用密码错误！请重新输入")
 print("欢迎来到贝尔编程！")