ModuleNotFoundError：当我尝试在 heroku 上部署我的 django 项目时，没有名为“fcntl”的模块

Question

I try to deploy my django project on heroku, and follow commands below

heroku login
git init
git add .
git commit -m "first commit"
heroku create
heroku git:remote -a name
pip install gunicorn
gunicorn application.wsgi

when it comes to the latest command, error occurs: ModuleNotFoundError: No module named 'fcntl'

How can I solve it?

Answer 1

Is the underlying operating system Windows? fcntl is not available on Windows system and Gunicorn does not work on windows

Run a WSGI web app (like Django) on Windows uing Waitress

Basically all you have to do is replace the gunicorn call with:

waitress-serve --listen=*:8000 myapp.wsgi:application

For typical apps this will give you the same result as running gunicorn. :) Good luck!

Answer 2

The fcntl module is not available on Windows. you should use waitress for http and for https use django-sslserver.