save project

diy2.py

@@ -6,8 +6,9 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if name!= username:
+    elif name!= username:
         print("用户名不存在")
-    if password != userpassword:
+    else:
+        if password != userpassword:
         print("密码错误!请重新输入")
 print("欢迎来到贝尔编程!")
\ No newline at end of file