Lintian tag information: python-depends-but-no-python-helper (type: error)

Description (from lintian-explain-tags)

The source package declares a dependency on ${python:Depends} in the given
binary package's debian/control entry. However, debian/rules doesn't call
any helper that would generate this substitution variable.

The source package probably needs a call to dh_python2 (possibly via the
Python2 debhelper add-on) in the debian/rules file.

Visibility: error
Show-Always: no
Check: debhelper

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