VERSION_PATTERN does not match python alpha version

[jouve]

• I am on the latest Poetry version.
• I have searched the issues of this repo and believe that this is not a duplicate.
• If an exception occurs when executing a command, I executed it again in debug mode (-vvv option).

• OS version and name: os x catalina
• Poetry version: 1.1.6
• Link of a Gist with the contents of your pyproject.toml file: does not matter

Issue

poetry uses https://github.com/python-poetry/poetry-core/blob/d3e51399d1f637ad3e52ff731625d466dedeb64b/poetry/core/version/pep440/parser.py to parse python version.

some alpha tags do not match the regex : https://github.com/python/cpython/blob/master/Include/patchlevel.h#L26

the specific part is the + at the end of 3.10.0a7+.

I asked about it at bugs.python.org:

PEP 440 applies to Python packages, not to CPython itself. The "+" convention has been used in CPython for a long time, and changing it without a strong justification seems risky.

If you consider this is not worth the effort (ie. running poetry with alpha python version), then you can close the issue :)

[github-actions]

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