Packages skipped by requires-python no longer show up in error message by default

[dpad]

Description

This is only a minor issue, but when trying to install a package with a requires-python that you don't meet, the error message no longer provides useful information about the Python version being incompatible.

For example, trying to pip install "ipython>9" while using Python 3.10 will result in an error, but the error message won't mention anything about a Python version incompatibility. As a user, this is confusing because ipython 9 definitely exists on PyPi, but it doesn't show up anywhere in the error message. In pip<25, the error message would explicitly state that version 9 was skipped due to a Python version incompatibility.

The cause seems to be due to the addition of the if not logger.isEnabledFor(logging.DEBUG) in _log_skipped_link() in #13128 . This change means that skipped links are not stored, so requires_python_skipped_reasons() returns nothing.

A work around is to use pip install -v or pip install -vv to see information about the Python requires incompatibilities.

Expected behavior

In pip-24.3.1, the error message includes a line as follows:

ERROR: Ignored the following versions that require a different python version: 9.0.0 Requires-Python >=3.11; 9.0.0b1 Requires-Python >=3.11; 9.0.0b2 Requires-Python >=3.11; 9.0.1 Requires-Python >=3.11

pip version

25.0.1

Python version

3.10.12

OS

Linux

How to Reproduce

1. Try to install a package with a requires-python that you don't meet
2. (e.g. pip install "ipython>9" when using Python 3.10)
3. Error message does not mention the version incompatibility.

Output

On pip 25.0.0 and 25.0.1:

$ pip install "ipython>9"

ERROR: Ignored the following yanked versions: 7.1.0, 7.30.0, 8.13.0, 8.16.0, 8.17.0, 8.19.0, 8.22.0
ERROR: Could not find a version that satisfies the requirement ipython>9 (from versions: 0.10, 0.10.1, 0.10.2, 0.11, 0.12, 0.12.1, 0.13, 0.13.1, 0.13.2, 1.0.0, 1.1.0, 1.2.0, 1.2.1, 2.0.0, 2.1.0, 2.2.0, 2.3.0, 2.3.1, 2.4.0, 2.4.1, 3.0.0, 3.1.0, 3.2.0, 3.2.1, 3.2.2, 3.2.3, 4.0.0b1, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.1.0rc1, 4.1.0rc2, 4.1.0, 4.1.1, 4.1.2, 4.2.0, 4.2.1, 5.0.0b1, 5.0.0b2, 5.0.0b3, 5.0.0b4, 5.0.0rc1, 5.0.0, 5.1.0, 5.2.0, 5.2.1, 5.2.2, 5.3.0, 5.4.0, 5.4.1, 5.5.0, 5.6.0, 5.7.0, 5.8.0, 5.9.0, 5.10.0, 6.0.0rc1, 6.0.0, 6.1.0, 6.2.0, 6.2.1, 6.3.0, 6.3.1, 6.4.0, 6.5.0, 7.0.0b1, 7.0.0rc1, 7.0.0, 7.0.1, 7.1.1, 7.2.0, 7.3.0, 7.4.0, 7.5.0, 7.6.0, 7.6.1, 7.7.0, 7.8.0, 7.9.0, 7.10.0, 7.10.1, 7.10.2, 7.11.0, 7.11.1, 7.12.0, 7.13.0, 7.14.0, 7.15.0, 7.16.0, 7.16.1, 7.16.2, 7.16.3, 7.17.0, 7.18.0, 7.18.1, 7.19.0, 7.20.0, 7.21.0, 7.22.0, 7.23.0, 7.23.1, 7.24.0, 7.24.1, 7.25.0, 7.26.0, 7.27.0, 7.28.0, 7.29.0, 7.30.1, 7.31.0, 7.31.1, 7.32.0, 7.33.0, 7.34.0, 8.0.0a1, 8.0.0b1, 8.0.0rc1, 8.0.0, 8.0.1, 8.1.0, 8.1.1, 8.2.0, 8.3.0, 8.4.0, 8.5.0, 8.6.0, 8.7.0, 8.8.0, 8.9.0, 8.10.0, 8.11.0, 8.12.0, 8.12.1, 8.12.2, 8.12.3, 8.13.1, 8.13.2, 8.14.0, 8.15.0, 8.16.1, 8.17.1, 8.17.2, 8.18.0, 8.18.1, 8.20.0, 8.21.0, 8.22.1, 8.22.2, 8.23.0, 8.24.0, 8.25.0, 8.26.0, 8.27.0, 8.28.0, 8.29.0, 8.30.0, 8.31.0, 8.32.0, 8.33.0)
ERROR: No matching distribution found for ipython>9

On pip 24.3.1:

$ pip install "ipython>9"

ERROR: Ignored the following yanked versions: 7.1.0, 7.30.0, 8.13.0, 8.16.0, 8.17.0, 8.19.0, 8.22.0
ERROR: Ignored the following versions that require a different python version: 9.0.0 Requires-Python >=3.11; 9.0.0b1 Requires-Python >=3.11; 9.0.0b2 Requires-Python >=3.11; 9.0.1 Requires-Python >=3.11
ERROR: Could not find a version that satisfies the requirement ipython>9 (from versions: 0.10, 0.10.1, 0.10.2, 0.11, 0.12, 0.12.1, 0.13, 0.13.1, 0.13.2, 1.0.0, 1.1.0, 1.2.0, 1.2.1, 2.0.0, 2.1.0, 2.2.0, 2.3.0, 2.3.1, 2.4.0, 2.4.1, 3.0.0, 3.1.0, 3.2.0, 3.2.1, 3.2.2, 3.2.3, 4.0.0b1, 4.0.0, 4.0.1, 4.0.2, 4.0.3, 4.1.0rc1, 4.1.0rc2, 4.1.0, 4.1.1, 4.1.2, 4.2.0, 4.2.1, 5.0.0b1, 5.0.0b2, 5.0.0b3, 5.0.0b4, 5.0.0rc1, 5.0.0, 5.1.0, 5.2.0, 5.2.1, 5.2.2, 5.3.0, 5.4.0, 5.4.1, 5.5.0, 5.6.0, 5.7.0, 5.8.0, 5.9.0, 5.10.0, 6.0.0rc1, 6.0.0, 6.1.0, 6.2.0, 6.2.1, 6.3.0, 6.3.1, 6.4.0, 6.5.0, 7.0.0b1, 7.0.0rc1, 7.0.0, 7.0.1, 7.1.1, 7.2.0, 7.3.0, 7.4.0, 7.5.0, 7.6.0, 7.6.1, 7.7.0, 7.8.0, 7.9.0, 7.10.0, 7.10.1, 7.10.2, 7.11.0, 7.11.1, 7.12.0, 7.13.0, 7.14.0, 7.15.0, 7.16.0, 7.16.1, 7.16.2, 7.16.3, 7.17.0, 7.18.0, 7.18.1, 7.19.0, 7.20.0, 7.21.0, 7.22.0, 7.23.0, 7.23.1, 7.24.0, 7.24.1, 7.25.0, 7.26.0, 7.27.0, 7.28.0, 7.29.0, 7.30.1, 7.31.0, 7.31.1, 7.32.0, 7.33.0, 7.34.0, 8.0.0a1, 8.0.0b1, 8.0.0rc1, 8.0.0, 8.0.1, 8.1.0, 8.1.1, 8.2.0, 8.3.0, 8.4.0, 8.5.0, 8.6.0, 8.7.0, 8.8.0, 8.9.0, 8.10.0, 8.11.0, 8.12.0, 8.12.1, 8.12.2, 8.12.3, 8.13.1, 8.13.2, 8.14.0, 8.15.0, 8.16.1, 8.17.1, 8.17.2, 8.18.0, 8.18.1, 8.20.0, 8.21.0, 8.22.1, 8.22.2, 8.23.0, 8.24.0, 8.25.0, 8.26.0, 8.27.0, 8.28.0, 8.29.0, 8.30.0, 8.31.0, 8.32.0, 8.33.0)

Code of Conduct

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[ichard26]

The performance uplift was very minor in the first place (0.7% on a cached homeassistant run) so I'm in favour of simply reverting the early exit. I'll file a PR in the next few days when I have time to write a test (unless someone beats me to it).

Thanks for the detailed bug report @dpad!