8000 Promote pending cm deprecations to full deprecations · matplotlib/matplotlib@a8eb350 · GitHub
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Promote pending cm deprecations to full deprecations
This is the next stage of #20853.
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‎doc/api/next_api_changes/deprecations/24846-ES.rst

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Deprecation of top-level cmap registration and access functions in ``mpl.cm``
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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As part of a `multi-step process
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<https://github.com/matplotlib/matplotlib/issues/20853>`_ we are refactoring
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the global state for managing the registered colormaps.
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In Matplotlib 3.5 we added a `.ColormapRegistry` class and exposed an instance
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at the top level as ``matplotlib.colormaps``. The existing top level functions
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in `matplotlib.cm` (``get_cmap``, ``register_cmap``, ``unregister_cmap``) were
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changed to be aliases around the same instance. In Matplotlib 3.6 we have
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marked those top level functions as pending deprecation.
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In Matplotlib 3.7, the following functions have been marked for deprecation:
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- ``matplotlib.cm.get_cmap``; use ``matplotlib.colormaps[name]`` instead if you
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have a `str`.
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**Added 3.6.1** Use `matplotlib.cm.ColormapRegistry.get_cmap` if you
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have a string, `None` or a `matplotlib.colors.Colormap` object that you want
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to convert to a `matplotlib.colors.Colormap` instance.
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- ``matplotlib.cm.register_cmap``; use `matplotlib.colormaps.register
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<.ColormapRegistry.register>` instead
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- ``matplotlib.cm.unregister_cmap``; use `matplotlib.colormaps.unregister
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<.ColormapRegistry.unregister>` instead
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- ``matplotlib.pyplot.register_cmap``; use `matplotlib.colormaps.register
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<.ColormapRegistry.register>` instead
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The `matplotlib.pyplot.get_cmap` function will stay available for backward
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compatibility.

‎lib/matplotlib/cm.py

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@@ -220,11 +220,7 @@ def get_cmap(self, cmap):
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globals().update(_colormaps)
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@_api.deprecated(
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'3.6',
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pending=True,
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alternative="``matplotlib.colormaps.register(name)``"
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)
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@_api.deprecated("3.7", alternative="``matplotlib.colormaps.register(name)``")
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def register_cmap(name=None, cmap=None, *, override_builtin=False):
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"""
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Add a colormap to the set recognized by :func:`get_cmap`.
@@ -301,19 +297,15 @@ def _get_cmap(name=None, lut=None):
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get_cmap = _api.deprecated(
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'3.6',
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name='get_cmap',
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pending=True,
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alternative=(
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"``matplotlib.colormaps[name]`` " +
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"or ``matplotlib.colormaps.get_cmap(obj)``"
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)
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)(_get_cmap)
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@_api.deprecated(
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'3.6',
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pending=True,
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alternative="``matplotlib.colormaps.unregister(name)``"
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)
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@_api.deprecated("3.7",
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alternative="``matplotlib.colormaps.unregister(name)``")
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def unregister_cmap(name):
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"""
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Remove a colormap recognized by :func:`get_cmap`.

‎lib/matplotlib/tests/test_colors.py

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@@ -68,7 +68,7 @@ def test_register_cmap():
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new_cm = mpl.colormaps["viridis"]
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target = "viridis2"
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with pytest.warns(
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PendingDeprecationWarning,
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mpl.MatplotlibDeprecationWarning,
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match=r"matplotlib\.colormaps\.register\(name\)"
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):
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cm.register_cmap(target, new_cm)
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with pytest.raises(ValueError,
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match="Arguments must include a name or a Colormap"):
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with pytest.warns(
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PendingDeprecationWarning,
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mpl.MatplotlibDeprecationWarning,
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match=r"matplotlib\.colormaps\.register\(name\)"
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):
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cm.register_cmap()
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with pytest.warns(
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PendingDeprecationWarning,
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mpl.MatplotlibDeprecationWarning,
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match=r"matplotlib\.colormaps\.unregister\(name\)"
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):
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cm.unregister_cmap(target)
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with pytest.raises(ValueError,
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match=f'{target!r} is not a valid value for name;'):
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with pytest.warns(
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PendingDeprecationWarning,
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mpl.MatplotlibDeprecationWarning,
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match=r"matplotlib\.colormaps\[name\]"
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):
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cm.get_cmap(target)
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with pytest.warns(
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PendingDeprecationWarning,
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mpl.MatplotlibDeprecationWarning,
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match=r"matplotlib\.colormaps\.unregister\(name\)"
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):
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# test that second time is error free
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cm.unregister_cmap(target)
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with pytest.raises(TypeError, match="'cmap' must be"):
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with pytest.warns(
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PendingDeprecationWarning,
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mpl.MatplotlibDeprecationWarning,
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match=r"matplotlib\.colormaps\.register\(name\)"
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):
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cm.register_cmap('nome', cmap='not a cmap')
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mpl.colormaps[name], name=name, force=True
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)
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with pytest.raises(ValueError, match='A colormap named "viridis"'):
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with pytest.warns(PendingDeprecationWarning):
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with pytest.warns(mpl.MatplotlibDeprecationWarning):
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cm.register_cmap(name, mpl.colormaps[name])
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with pytest.warns(UserWarning):
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# TODO is warning more than once!
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name = "viridis"
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match = f'cannot unregister {name!r} which is a builtin colormap.'
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with pytest.raises(ValueError, match=match):
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with pytest.warns(PendingDeprecationWarning):
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with pytest.warns(mpl.MatplotlibDeprecationWarning):
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cm.unregister_cmap(name)
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