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monkeypatch: remove pkg_resources.fixup_namespace_packages call in syspath_prepend #13807

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monkeypatch: remove pkg_resources.fixup_namespace_packages call in syspath_prepend#13807
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#13808
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bluetech
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plugin: monkeypatchrelated to the monkeypatch builtin plugintype: backward compatibilitymight present some backward compatibility issues which should be carefully noted in the changelogtype: deprecationfeature that will be removed in the futuretype: proposalproposal for a new feature, often to gather opinions or design the API around the new feature
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@bluetech
bluetech
opened on Oct 13, 2025

monkeypatch.syspath_prepend calls it:

pytest/src/_pytest/monkeypatch.py

Lines 340 to 351 in 9d74e03

def syspath_prepend(self, path) -> None:
"""Prepend ``path`` to ``sys.path`` list of import locations."""
if self._savesyspath is None:
self._savesyspath = sys.path[:]
sys.path.insert(0, str(path))
# https://github.com/pypa/setuptools/blob/d8b901bc/docs/pkg_resources.txt#L162-L171
# this is only needed when pkg_resources was already loaded by the namespace package
if "pkg_resources" in sys.modules:
from pkg_resources import fixup_namespace_packages
fixup_namespace_packages(str(path))

This is needed for legacy namespace package support, which is now deprecated, along with the entire pkg_resources package.

I saw recently that zope packages which were the last holdouts I was familiar with had switched to new namespace package style, zope.event, zope.interface.

Let's start removing it. The main reason is that it requires us to have a setuptools dev dependency, ignore its deprecation warnings and keep it working.

Let's deprecate it and remove in pytest 10.

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plugin: monkeypatchrelated to the monkeypatch builtin plugintype: backward compatibilitymight present some backward compatibility issues which should be carefully noted in the changelogtype: deprecationfeature that will be removed in the futuretype: proposalproposal for a new feature, often to gather opinions or design the API around the new feature

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