Remove mpl.colors deprecations for 3.4

Author: dstansby

doc/api/colors_api.rst

@@ -20,7 +20,6 @@ Classes
 
    BoundaryNorm
    Colormap
-   DivergingNorm
    LightSource
    LinearSegmentedColormap
    ListedColormap
@@ -47,5 +46,4 @@ Functions
    to_rgba_array
    is_color_like
    same_color
-   makeMappingArray
    get_named_colors_mapping

doc/api/next_api_changes/removals/18201-DS.rst

@@ -0,0 +1,5 @@
+`matplotlib.colors` removals
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+- ``makeMappingArray`` has been removed.
+- ``DivergingNorm`` has been renamed to `~matplotlib.colors.TwoSlopeNorm`.

doc/api/prev_api_changes/api_changes_3.2.0/deprecations.rst

@@ -223,7 +223,7 @@ to a NumPy array with ``np.asarray`` before processing it.
 
 Colors
 ~~~~~~
-The function `matplotlib.colors.makeMappingArray` is not considered part of
+The function ``matplotlib.colors.makeMappingArray`` is not considered part of
 the public API any longer. Thus, it's deprecated.
 
 Using a string of single-character colors as a color sequence (e.g. "rgb") is

lib/matplotlib/colors.py

@@ -78,7 +78,7 @@
 
 import matplotlib as mpl
 import numpy as np
-from matplotlib import cbook, docstring, scale
+from matplotlib import cbook, scale
 from ._color_data import BASE_COLORS, TABLEAU_COLORS, CSS4_COLORS, XKCD_COLORS
 
 
@@ -479,13 +479,6 @@ def _create_lookup_table(N, data, gamma=1.0):
     return np.clip(lut, 0.0, 1.0)
 
 
-@cbook.deprecated("3.2",
-                  addendum='This is not considered public API any longer.')
-@docstring.copy(_create_lookup_table)
-def makeMappingArray(N, data, gamma=1.0):
-    return _create_lookup_table(N, data, gamma)
-
-
 def _warn_if_global_cmap_modified(cmap):
     if getattr(cmap, '_global', False):
         cbook.warn_deprecated(
@@ -763,9 +756,6 @@ def __init__(self, name, segmentdata, N=256, gamma=1.0):
         LinearSegmentedColormap.from_list
             Static method; factory function for generating a smoothly-varying
             LinearSegmentedColormap.
-
-        makeMappingArray
-            For information about making a mapping array.
         """
         # True only if all colors in map are identical; needed for contouring.
         self.monochrome = False
@@ -1185,11 +1175,6 @@ def __call__(self, value, clip=None):
         return result
 
 
-@cbook.deprecation.deprecated('3.2', alternative='TwoSlopeNorm')
-class DivergingNorm(TwoSlopeNorm):
-    ...
-
-
 def _make_norm_from_scale(scale_cls, base_norm_cls=None, *, init=None):
     """
     Decorator for building a `.Normalize` subclass from a `.Scale` subclass.

lib/matplotlib/tests/test_colors.py

@@ -1138,11 +1138,6 @@ def test_hex_shorthand_notation():
     assert mcolors.same_color("#123a", "#112233aa")
 
 
-def test_DivergingNorm_deprecated():
-    with pytest.warns(cbook.MatplotlibDeprecationWarning):
-        norm = mcolors.DivergingNorm(vcenter=0)
-
-
 def test_repr_png():
     cmap = plt.get_cmap('viridis')
     png = cmap._repr_png_()