Django，执行Python manage.py runserver 时报错

报错信息：

Performing system checks...

System check identified no issues (0 silenced).

You have 13 unapplied migration(s). Your project may not work properly until you apply the migrations for app(s): admin, auth, contenttypes, sessions.
Run 'python manage.py migrate' to apply them.
July 01, 2019 - 20:09:11
Django version 1.11.11, using settings 'books.settings'
Starting development server at http://127.0.0.1:8000/
Quit the server with CTRL-BREAK.
Error: [WinError 10013] 以一种访问权限不允许的方式做了一个访问套接字的尝试。

原因：
这种的启动方式，Django默认启动的8000端口，而上述的问题是： 8000端口被占用导致的，更换端口即可解决

python manage.py runserver 8080