Deprecate and remove `--no-python-version-warning` as Python 2 is dead

[ichard26]

Update (April 3rd, 2025) - the deprecation and removal has been cancelled. The flag is still a no-op and does not serve a purpose, but it will remain to avoid breaking old scripts and tools. The flag is more prevalent than we thought.

The Python 2 days are behind us, thus we can kill off the --no-python-version-warning flag which disabled the "Python 2 is sunsetting support" warnings :)

If you're using this flag, you can simply stop. It does nothing today.

[jsirois]

FWIW the help text says nothing at all about Python 2 and suggests the option is useful today to - for example - warn that Python 3.8 support is going away:

pip/src/pip/_internal/cli/cmdoptions.py

Lines 987 to 994 in 0d609f7

	no_python_version_warning: Callable[..., Option] = partial(
	Option,
	"--no-python-version-warning",
	dest="no_python_version_warning",
	action="store_true",
	default=False,
	help="Silence deprecation warnings for upcoming unsupported Pythons.",
	)

[ichard26]

Yeah.. we've never done that other than for the Python 2 sunset. We could start warning, but seems unnecessary, especially as we're more on the conservative side when it comes to dropping Python versions. Once we drop a Python version, it probably has fallen out of major use (and the folks still using it can't be using the latest and greatest for other parts of the ecosystem already).