[Python-modules-team] Bug#896365: python3-setuptools-scm: setuptools_scm fails to import

[Helmut Grohne]

Package: python3-setuptools-scm
Version: 1.17.0-1
Severity: serious
User: helmutg at debian.org
Usertags: python-import

After installing python3-setuptools-scm importing the module setuptools_scm
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/setuptools_scm/__init__.py", line 10, in <module>
    from .version import format_version, meta, ScmVersion
  File "/usr/lib/python3/dist-packages/setuptools_scm/version.py", line 7, in <module>
    from pkg_resources import iter_entry_points
ModuleNotFoundError: No module named 'pkg_resources'

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