Lintian tag information: python-foo-but-no-python3-foo (type: warning)

Description (from lintian-explain-tags)

This source package appears to generate the specified Python 2 package
without creating a variant for Python 3.

The 2.x series of Python is due for deprecation and will not be maintained
by upstream past 2020 and will likely be dropped after the release of
Debian "buster".

If upstream have not moved or have no intention to move to Python 3,
please be certain that Debian would benefit from the continued inclusion
of this package and, if not, consider removing it.

Alternatively, ensure that the corresponding package specifies the
${python3:Depends} substvar in its binary dependencies.

Visibility: warning
Show-Always: no
Check: languages/python

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