save project

diy2.py

@@ -6,8 +6,7 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if name!=username:
+    elif name!=username:
         print("用户不存在，请重新输入")
-        continue
-    if password!=userpassword:
+    else:
         print("用户密码输入错误，请重新输入")