[Debian-astro-maintainers] Bug#896381: python3-imexam: imexam fails to import

[Helmut Grohne]

Package: python3-imexam
Version: 0.8.0-1
Severity: serious
User: helmutg at debian.org
Usertags: python-import

After installing python3-imexam importing the module imexam
into a python interpreter fails with the following error:

/usr/lib/python3/dist-packages/astropy/config/configuration.py:536: ConfigurationMissingWarning: Configuration defaults will be used due to FileNotFoundError:2 on None
  warn(ConfigurationMissingWarning(msg))
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/imexam/__init__.py", line 26, in <module>
    from . import connect as _connect
  File "/usr/lib/python3/dist-packages/imexam/connect.py", line 29, in <module>
    from .imexamine import Imexamine
  File "/usr/lib/python3/dist-packages/imexam/imexamine.py", line 29, in <module>
    import matplotlib.pyplot as plt
ModuleNotFoundError: No module named 'matplotlib'

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