func animation warning changes

fredrik-1 · fredrik-1 · commit b693532b8638 · 2018-08-09T11:06:54.000+02:00
diff --git a/lib/matplotlib/animation.py b/lib/matplotlib/animation.py
@@ -1725,11 +1725,13 @@ def _draw_frame(self, framedata):
 
         # Call the func with framedata and args. If blitting is desired,
         # func needs to return a sequence of any artists that were modified.
-        self._drawn_artists = sorted(self._func(framedata, *self._args),
-                                     key=lambda x: x.get_zorder())
+        self._drawn_artists = self._func(framedata, *self._args)
         if self._blit:
             if self._drawn_artists is None:
                 raise RuntimeError('The animation function must return a '
                                    'sequence of Artist objects.')
+            self._drawn_artists = sorted(self._drawn_artists,
+                                         key=lambda x: x.get_zorder())
+
             for a in self._drawn_artists:
                 a.set_animated(self._blit)
