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MNT: be explicitly strict in FunctionAnimation #6336

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Merged
merged 1 commit into from
Apr 27, 2016
Merged

MNT: be explicitly strict in FunctionAnimation #6336

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10 changes: 8 additions & 2 deletions 10 lib/matplotlib/animation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1113,8 +1113,8 @@ class FuncAnimation(TimedAnimation):
results of drawing from the first item in the frames sequence will be
used. This function will be called once before the first frame.

If blit=True, *func* and *init_func* should return an iterable of
drawables to clear.
If blit=True, *func* and *init_func* must return an iterable of
artists to be re-drawn.

*kwargs* include *repeat*, *repeat_delay*, and *interval*:
*interval* draws a new frame every *interval* milliseconds.
Expand Down Expand Up @@ -1195,6 +1195,9 @@ def _init_draw(self):
else:
self._drawn_artists = self._init_func()
if self._blit:
if self._drawn_artists is None:
raise RuntimeError('The init_func must return a '
'sequence of Artist objects.')
for a in self._drawn_artists:
a.set_animated(self._blit)
self._save_seq = []
Expand All @@ -1211,5 +1214,8 @@ def _draw_frame(self, framedata):
# func needs to return a sequence of any artists that were modified.
self._drawn_artists = self._func(framedata, *self._args)
if self._blit:
if self._drawn_artists is None:
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This condition will never be True.

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Ah, did it one way, and then the other and forgot to remove the old version.

raise RuntimeError('The animation function must return a '
'sequence of Artist objects.')
for a in self._drawn_artists:
a.set_animated(self._blit)
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