#16737 `./pants check` fails in the official `example-django` repository after adding any third party dependency. Issue created by dolphinigle Reproduction https://github.com/dolphinigle/example-django It's a fork of the official django example with this small commit adding celery being the only change. Describe the bug Adding any third party library (

celery

in the following) to the

example-django

repository causes

./pants check

to fail with the following error:

ModuleNotFoundError: No module named 'celery'

See the slack discussion: https://app.slack.com/client/T046T6T8L/C046T6T9U/thread/C046T6T9U-1661627014.305049 Pants version 2.12.0 OS Linux Additional info The root cause is that the

mypy_django_plugin

needs to load the Django models at the start, which it cannot do without the dependencies installed in the mypy virtual environment. Adding

celery

to

extra_requirements

under

[mypy]

in

pants.toml

removes this error, but this seems to be a hack. In my actual repo, I would need to add around fifty requirements here, which would be difficult to maintain. Excerpt from the slack discussion: pantsbuild/pants