save project

diy2.py

@@ -6,8 +6,8 @@ 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，请重新输入!")
-    if password!=userpassword:
+    else:
         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