Add Version Mismatch Alert

[anudit]

Prototype Implementation for #7797

[anudit]

@uranusjr @pradyunsg The checks are completed and passing on the Azure pipeline but don't seem to have propagated to GitHub.

[anudit]

@uranusjr @pradyunsg

[uranusjr]

I feel the message has some room for improvement; the current wording could be confusing to less experienced users. Python version mismatch… to what?

I have Python version 3.5 (for example), there’s nothing wrong with it?? (simulated response)

[uranusjr]

The final link part looks weird to me, but I don’t have a good suggestion either 🤔

[anudit]

The link is utilized for testing as I see here

pip/tests/unit/test_index.py

Lines 80 to 82 in 4775afb

	expected_return, expected_level, expected_message = expected
	link = Link('https://example.com', requires_python='== 3.6.4')
	caplog.set_level(logging.DEBUG)

[uranusjr]

The news fragment should be named 7797.feature to allow easy referencing the issue number in the changelog.

[anudit]

The news fragment should be named 7797.feature to allow easy referencing the issue number in the changelog.

Updated, Should close #7797. @pfmoore @pradyunsg @chrahunt

[deveshks]

Hi @anuditnagar

You should probably revisit the approach in this PR. As per #7797 (comment) , changing the message to logger.info would flood the output with a lot of Link requires a different Python.. messages, one for every package version being checked.

I just tried this on python2.7 when trying to install numpy as per the comment, and I got a total of 15 messages.

$ python --version
Python 2.7.16

$ pip install numpy
DEPRECATION: Python 2.7 reached the end of its life on January 1st, 2020. Please upgrade your Python as Python 2.7 is no longer maintained. pip 21.0 will drop support for Python 2.7 in January 2021. More details about Python 2 support in pip, can be found at https://pip.pypa.io/en/latest/development/release-process/#python-2-support
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/c1/ff/aeb22192bab0643551a161dc4ed305892cead687ee97453daed4dc1dd38e/numpy-1.17.0rc1.zip#sha256=f53df05f9ca4ec5d72709ffe349704f1f7d945ed59e815574b5c5687acb282c4 (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/93/9b/443bbd1b38c4e5617f32c14c1494ae884d36cf3870c33828bb32e4b00dea/numpy-1.17.0rc2.zip#sha256=a4153fe85cf92a796022b81b138000160dea840cad13b7d1db67cfec594ece23 (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/da/32/1b8f2bb5fb50e4db68543eb85ce37b9fa6660cd05b58bddfafafa7ed62da/numpy-1.17.0.zip#sha256=951fefe2fb73f84c620bec4e001e80a80ddaa1b84dce244ded7f1e0cbe0ed34a (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/cb/79/96df883cd6df0c86cb010e6f4ff790b7a30a45016a9509c94ea72c8695cd/numpy-1.17.1.zip#sha256=f11331530f0eff69a758d62c2461cd98cdc2eae0147279d8fc86e0464eb7e8ca (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/ac/36/325b27ef698684c38b1fe2e546e2e7ef9cecd7037bcdb35c87efec4356af/numpy-1.17.2.zip#sha256=73615d3edc84dd7c4aeb212fa3748fb83217e00d201875a47327f55363cef2df (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/b6/d6/be8f975f5322336f62371c9abeb936d592c98c047ad63035f1b38ae08efe/numpy-1.17.3.zip#sha256=a0678793096205a4d784bd99f32803ba8100f639cf3b932dc63b21621390ea7e (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/ff/59/d3f6d46aa1fd220d020bdd61e76ca51f6548c6ad6d24ddb614f4037cf49d/numpy-1.17.4.zip#sha256=f58913e9227400f1395c7b800503ebfdb0772f1c33ff8cb4d6451c06cabdf316 (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/d9/09/8e89c05abc450ea347f40b4fa917ec5c69b5228da344487f178586a3187c/numpy-1.17.5.zip#sha256=16507ba6617f62ae3c6ab1725ae6f550331025d4d9a369b83f6d5a470446c342 (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/21/94/5d48401d922ad494399f74a973445d831c888ef0cd9437a4276d8a63cfe5/numpy-1.18.0rc1.zip#sha256=7b0b915190cf60e691c17147f5d955e273d4c482b795a7bb168ad4a2fe2fb180 (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/31/0a/5df350c29a06835d534a6c4f5681075304da38d85f1c69e5226a635a67ce/numpy-1.18.0.zip#sha256=a9d72d9abaf65628f0f31bbb573b7d9304e43b1e6bbae43149c17737a42764c4 (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/40/de/0ea5092b8bfd2e3aa6fdbb2e499a9f9adf810992884d414defc1573dca3f/numpy-1.18.1.zip#sha256=b6ff59cee96b454516e47e7721098e6ceebef435e3e21ac2d6c3b8b02628eb77 (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/84/1e/ff467ac56bfeaea51d4a2e72d315c1fe440b20192fea7e460f0f248acac8/numpy-1.18.2.zip#sha256=e7894793e6e8540dbeac77c87b489e331947813511108ae097f1715c018b8f3d (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/0c/e8/c49cb52ed2ad734efb49eb1f7766888b0e65df1848f71fa7f7fd52183392/numpy-1.18.3.zip#sha256=e46e2384209c91996d5ec16744234d1c906ab79a701ce1a26155c9ec890b8dc8 (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/2d/f3/795e50e3ea2dc7bc9d1a2eeea9997d5dce63b801e08dfc37c2efce341977/numpy-1.18.4.zip#sha256=bbcc85aaf4cd84ba057decaead058f43191cc0e30d6bc5d44fe336dc3d3f4509 (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
  Link requires a different Python (2.7.16 not in: u'>=3.5'): https://files.pythonhosted.org/packages/ab/19/b958d7edc81fe7cff0a7f8f981f9d87e9b13b0f3e03bcbb643cab68d5d4e/numpy-1.19.0rc1.zip#sha256=1ae657a2390cbc1553df60cb2a5f69742761d0ad5957b0113c9c00bb06276a78 (from https://pypi.org/simple/numpy/) (requires-python:>=3.5)
Collecting numpy
.....

[pradyunsg]

Closing due to lack of movement here. Please feel free to file a new PR if you want to get the ball rolling again! :)