GeezerVison

Context

In release 2.8.24 type hinting was introduced (#533) to allure-python-common package, and no python_requires directive has been added to setup.py script. It lead to failures on new python <3.5 installations, with package managers installing the newest version 2.9.43 which won't work on those python versions.

I feel like pip should install latest compatible version without needing of user to dig into code and see what the problem is, as, i think, majority of allure-python integration users is QA engineers, who might not have a solid python background to understand what the issue is and how to resolve it.

What is the motivation / use case for changing the behavior?

Provide a better UX for users of deprecated python versions (python2.7 is not the only version which won't work with newest package release, typing module was introduced in 3.5)

Proposal to resolve the issue.

Currently I can see a three ways of dealing with the problem:

1. Fix metadata for a new release:
   1.1 Add python_requires='>=3.5' directive to setup.py script of allure-python-commons package
   1.2 Fix classifiers of all packages removing python2 support and adding Python 3 Only classifiers.
   1.3 Release 2.9.44 which contains fixed metadata.
   1.4 Re-release 2.8.22 version as 2.9.43.1

This way:

• Pinned releases are not broken
• >= Python3.5 installs will install release 2.9.44
• < Python3.5 install will install release 2.9.43.1 which will be compatible with those versions.

2. Same as 1, but instead of re-releasing 2.8.22 - yank all broken releases from pypi (https://www.python.org/dev/peps/pep-0592/) Yanking is done using pypi UI.

This way:

• Pinned releases are not broken
• >= Python3.5 installs will install release 2.9.44
• < Python3.5 install will install release 2.8.22
• No 2.9.43.1 version
• Yanking is a new feature, not all installers might support it.

3. Drop deprecated pythons support. Change README.MD to make it clear that latest release to work on python < 3.5 is 2.8.22. Maybe add an exception in setup.py script which will be raised if minimal python version doesn't satsified.

PR Is for ways 1 and 2.

Checklist

• Sign Allure CLA
• Provide unit tests

Unittest are not needed as there were no code changes.