Merge pull request matplotlib#18502 from timhoffm/remove-revcmap

Remove the deprecated matplotlib.cm.revcmap()

Author: QuLogic

doc/api/next_api_changes/removals/18502-TH.rst

@@ -0,0 +1,5 @@
+``matplotlib.cm`` removals
+~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- ``matplotlib.cm.revcmap()`` has been removed. Use ``Colormap.reversed()``
+  instead.

lib/matplotlib/cm.py

@@ -16,7 +16,6 @@
 """
 
 from collections.abc import MutableMapping
-import functools
 
 import numpy as np
 from numpy import ma
@@ -27,25 +26,6 @@
 from matplotlib._cm_listed import cmaps as cmaps_listed
 
 
-def _reverser(f, x):  # Deprecated, remove this at the same time as revcmap.
-    return f(1 - x)  # Toplevel helper for revcmap ensuring cmap picklability.
-
-
-@cbook.deprecated("3.2", alternative="Colormap.reversed()")
-def revcmap(data):
-    """Can only handle specification *data* in dictionary format."""
-    data_r = {}
-    for key, val in data.items():
-        if callable(val):
-            # Return a partial object so that the result is picklable.
-            valnew = functools.partial(_reverser, val)
-        else:
-            # Flip x and exchange the y values facing x = 0 and x = 1.
-            valnew = [(1.0 - x, y1, y0) for x, y0, y1 in reversed(val)]
-        data_r[key] = valnew
-    return data_r
-
-
 LUTSIZE = mpl.rcParams['image.lut']