[Python-modules-team] Bug#896216: python3-pytest-cookies: pytest_cookies fails to import

[Helmut Grohne]

Package: python3-pytest-cookies
Version: 0.3.0-1
Severity: serious
User: helmutg at debian.org
Usertags: python-import

After installing python3-pytest-cookies importing the module pytest_cookies
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/pytest_cookies.py", line 6, in <module>
    from cookiecutter.main import cookiecutter
  File "/usr/lib/python3/dist-packages/cookiecutter/main.py", line 15, in <module>
    from .generate import generate_context, generate_files
  File "/usr/lib/python3/dist-packages/cookiecutter/generate.py", line 27, in <module>
    from .hooks import run_hook
  File "/usr/lib/python3/dist-packages/cookiecutter/hooks.py", line 13, in <module>
    from cookiecutter import utils
  File "/usr/lib/python3/dist-packages/cookiecutter/utils.py", line 19, in <module>
    from .prompt import read_user_yes_no
  File "/usr/lib/python3/dist-packages/cookiecutter/prompt.py", line 14, in <module>
    from past.builtins import basestring
  File "/usr/lib/python3/dist-packages/past/__init__.py", line 88, in <module>
    from past.translation import install_hooks as autotranslate
  File "/usr/lib/python3/dist-packages/past/translation/__init__.py", line 41, in <module>
    from lib2to3.pgen2.parse import ParseError
ModuleNotFoundError: No module named 'lib2to3'

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