matplotlib
diff --git a/‎lib/matplotlib/_cm.py
Copy file name to clipboardExpand all lines: lib/matplotlib/_cm.py
+15-2Lines changed: 15 additions & 2 deletions b/‎lib/matplotlib/_cm.py
Copy file name to clipboardExpand all lines: lib/matplotlib/_cm.py
+15-2Lines changed: 15 additions & 2 deletions
diff --git a/‎lib/matplotlib/cm.py
Copy file name to clipboardExpand all lines: lib/matplotlib/cm.py
+2-2Lines changed: 2 additions & 2 deletions b/‎lib/matplotlib/cm.py
Copy file name to clipboardExpand all lines: lib/matplotlib/cm.py
+2-2Lines changed: 2 additions & 2 deletions
@@ -9,6 +9,7 @@
 from __future__ import (absolute_import, division, print_function,
                         unicode_literals)
 
+from matplotlib.cbook import warn_deprecated
 import numpy as np
 
 _binary_data = {
@@ -1365,7 +1366,19 @@ def gfunc32(x):
     )
 
 
-datad = {
+class _deprecation_datad(dict):
+    def __getitem__(self, key):
+        if key == "spectral":
+            warn_deprecated(
+                "2.0",
+                name="spectral",
+                alternative="nipy_spectral",
+                obj_type="colormap"
+                )
+        return super(_deprecation_datad, self).__getitem__(key)
+
+
+datad = _deprecation_datad({
     'afmhot': _afmhot_data,
     'autumn': _autumn_data,
     'bone':   _bone_data,
@@ -1394,7 +1407,7 @@ def gfunc32(x):
     'winter': _winter_data,
     'nipy_spectral': _nipy_spectral_data,
     'spectral': _nipy_spectral_data,  # alias for backward compatibility
-    }
+    })
 
 
 datad['Blues'] = _Blues_data
 
@@ -16,11 +16,11 @@
 import matplotlib as mpl
 import matplotlib.colors as colors
 import matplotlib.cbook as cbook
-from matplotlib._cm import datad
+from matplotlib._cm import datad, _deprecation_datad
 from matplotlib._cm import cubehelix
 from matplotlib._cm_listed import cmaps as cmaps_listed
 
-cmap_d = dict()
+cmap_d = _deprecation_datad()
 
 # reverse all the colormaps.
 # reversed colormaps have '_r' appended to the name.