matplotlib
diff --git a/‎lib/matplotlib/cm.py
Copy file name to clipboardExpand all lines: lib/matplotlib/cm.py
+10-1Lines changed: 10 additions & 1 deletion b/‎lib/matplotlib/cm.py
Copy file name to clipboardExpand all lines: lib/matplotlib/cm.py
+10-1Lines changed: 10 additions & 1 deletion
@@ -83,8 +83,9 @@ def _generate_cmap(name, lutsize):
 
 # We silence warnings here to avoid raising the deprecation warning for
 # spectral/spectral_r when this module is imported.
-with _warnings.catch_warnings():
+with _warnings.catch_warnings(record=True):
     _warnings.simplefilter("ignore")
+    _wr = getattr(cbook, '__warningregistry__', None)
     # Generate the reversed specifications (all at once, to avoid
     # modify-when-iterating).
     datad.update({cmapname + '_r': _reverse_cmap_spec(spec)
@@ -95,6 +96,14 @@ def _generate_cmap(name, lutsize):
     for cmapname in datad:
         cmap_d[cmapname] = _generate_cmap(cmapname, LUTSIZE)
 
+    # Work around Python 2.7 bug. See https://bugs.python.org/issue4180
+    # and http://stackoverflow.com/q/2390766
+    if _wr is not None:
+        cbook.__warningregistry__.clear()
+        cbook.__warningregistry__.update(_wr)
+    else:
+        del cbook.__warningregistry__
+
 cmap_d.update(cmaps_listed)
 
 locals().update(cmap_d)