May 2, 2025 · May 2, 2025
diff --git a/doc/api/prev_api_changes/api_changes_3.8.0/behaviour.rst b/doc/api/prev_api_changes/api_changes_3.8.0/behaviour.rst

 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.
Original file line number	Diff line number	Diff line change
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.