[Python-modules-team] Bug#896425: python3-django-cors-headers: corsheaders fails to import

[Helmut Grohne]

Package: python3-django-cors-headers
Version: 2.1.0+github-2
Severity: serious
User: helmutg at debian.org
Usertags: python-import

After installing python3-django-cors-headers importing the module corsheaders
into a python interpreter fails with the following error:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/corsheaders/__init__.py", line 1, in <module>
    from .checks import check_settings  # noqa: F401
  File "/usr/lib/python3/dist-packages/corsheaders/checks.py", line 5, in <module>
    from django.core import checks
ModuleNotFoundError: No module named 'django'

The vast majority of import failures is attributed to missing dependencies.
Often times that manifests as an ImportError or ModuleNotFoundError.
Typically, dependencies should be inserted by dh-python via ${python:Depends}
or ${python3:Depends}. Thus a missing dependency can be caused by incomplete
install_requires in setup.py. Sometimes a missing dependency of a dependency
is the cause, in such cases this bug should be reassigned.

Helmut