pycharm 中建立django工程，然后運行其中任意文件，提示You have unapplied migrations; your app may not work properly until they are applied.Run 'python manage.py migrate' to apply them.（可以打開localhost的網頁，網頁顯示：‘It worked!Congratulations on your first Django-powered page.Of course, you haven't actually done any work yet. Next, start your first app by running python manage.py startapp [app_label].You're seeing this message because you have DEBUG = True in your Django settings file and you haven't configured any URLs. Get to work!’）請問這個是在cmd命令中使用嗎？（我在cmd中試用了一下：）我是python3（python2.7也試用了）然后在cmd中（進入到了python文件目錄）輸入'python manage.py migrate'提示：invalid syntax請問這個如何解決？