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Another documentation update

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Westacular committed May 4, 2013
1 parent cd18645 commit 71e9ad992cac308eb78e1bc7a6ed1c61621055e2
Showing with 5 additions and 2 deletions.
  1. +5 −2 lib/matplotlib/backend_bases.py
@@ -836,8 +836,11 @@ def get_snap(self):
def set_alpha(self, alpha):
"""
- Set the alpha value used for blending - not supported on
- all backends
+ Set the alpha value used for blending - not supported on all backends.
+ If ``alpha=None`` (the default), the alpha components of the
+ foreground and fill colors will be used to set their respective
+ transparencies (where applicable); otherwise, ``alpha`` will override
+ them.
"""
if alpha is not None:
self._alpha = alpha

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