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Backport PR #29673 on branch v3.10.x (DOC: document the issues with overlaying new mpl on old mpl) #30002

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May 2, 2025
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Backport PR #29673 on branch v3.10.x (DOC: document the issues with overlaying new mpl on old mpl) #30002

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19 changes: 19 additions & 0 deletions doc/api/prev_api_changes/api_changes_3.8.0/behaviour.rst
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Expand Up @@ -171,3 +171,22 @@ saved.

Previously, *mincnt* was inclusive with no *C* provided but exclusive when *C* is provided.
It is now inclusive of *mincnt* in both cases.


``matplotlib.mpl_toolkits`` is now an implicit namespace package
----------------------------------------------------------------

Following the deprecation of ``pkg_resources.declare_namespace`` in ``setuptools`` 67.3.0,
``matplotlib.mpl_toolkits`` is now implemented as an implicit namespace, following
`PEP 420 <https://peps.python.org/pep-0420/>`_.

As a consequence using ``pip`` to install a version of Matplotlib >= 3.8 on top
of a version of Matplotlib < 3.8 (e.g. via ``pip install --local`` or
``python -m venv --system-site-packages ...``) will fail because the old
``matplotlib.mpl_toolkits`` files will be found whereas the newer files will be
found for all other modules. This will result in errors due to the version
mismatch.

To avoid this issue you need to avoid having multiple versions of Matplotlib
in different entries of ``sys.path``. Either uninstall Matplotlib
at the system level or use a more isolated virtual environment.