warning on figure('all') creation

butterw · butterw · commit 4d451602b870 · 2011-06-20T20:49:39.000+02:00
diff --git a/lib/matplotlib/pyplot.py b/lib/matplotlib/pyplot.py
@@ -14,7 +14,7 @@
 
 """
 
-import sys
+import sys, warnings
 
 import matplotlib
 from matplotlib import _pylab_helpers, interactive
@@ -266,6 +266,8 @@ class that will be passed on to :meth:`new_figure_manager` in the
         figLabel = num
         allLabels = get_figlabels()
         if figLabel not in allLabels:
+            if figLabel == 'all':
+                warnings.warn("close('all') closes all existing figures")
             if len(allLabels):
                 num = max(allnums) + 1
             else:
