save project

diy2.py

@@ -6,6 +6,8 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    elif name != 
-    print("用户名和密码错误!请重新输入")
+    elif name != username:
+        print("该用户不存在,请重新输入!")
+    else:
+        print("密码输入错误!请重新输入!")
 print("欢迎来到贝尔编程!")
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