Twine 3.8 - missing install requirement

[craig-reahl]

Environment

1. Operating system:
   Ubuntu 20.04

2. Version of python:
   3.8

3. Twine installed method
   pip install twine

4. Version of twine:
   twine-3.8.0-py3-none-any.whl

5. Target repository for twine to upload to?
   pypi

The Issue

The "twine upload" command breaks with stacktrace:

 Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.8.12/x64/bin/twine", line 5, in <module>
    from twine.__main__ import main
  File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/twine/__main__.py", line 22, in <module>
    from twine import cli
  File "/opt/hostedtoolcache/Python/3.8.12/x64/lib/python3.8/site-packages/twine/cli.py", line 18, in <module>
    from packaging import requirements
ModuleNotFoundError: No module named 'packaging'

Workaround

install the "packaging" package manually: pip install packaging

Proposed fix:

Add "packing" to install_requires section in https://github.com/pypa/twine/blob/main/setup.cfg

Steps to Reproduce

create a new python virtualenv without installing any packages except twine
It seems that if you install tox, tox installs the missing package twine itself requires(packaging). So not installing tox in an environment and only installing twine, reproduces the error:
pip install twine

twine upload --skip-existing -r pypi sample-1.0.0-py3-none-any.whl sample-1.0.0-py3-none-any.whl.asc

This command will break and indicated above.

[bhrutledge]

Weird. I get the same error after running pip install twine==3.8.0 in a fresh virtual environment, and the requirement is clearly missing, but Twine 3.8.0 has been available since February 2022, and I think this is the first we're hearing of this issue. I wonder if packaging was being installed as transitive dependency of a direct dependency that's been recently updated to no longer require packaging.

That said, this has been fixed in Twine 4.0.0, specifically c506b22, which removed the packaging import. Can you pip install -U twine?

[craig-reahl]

Yes, thanks @bhrutledge , the upgrade to 4.0.0 does solve the issue.

I'm happy if you want to close this issue.

[merwok]

What? Your issue, this ticket and the linked ticket are three different things.

[merwok]

«Stack» is a very generic programming term. The website you are referring to is called Stack Overflow, or short SO. Nobody calls it stack.

This is the Twine repo on Github, it has no relation with Stack Overflow. Complaining about another site’s policies is fruitless.
Reopening unrelated bugs will not get you help.