No need to remove figure.show when pickling.

anntzer · anntzer · commit ba6c0f46e32a · 2020-01-14T00:44:57.000+01:00
We stopped monkeypatching figure.show on the figure instance in 51ffd4b.
diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
@@ -1961,7 +1961,7 @@ def __getstate__(self):
         # The canvas cannot currently be pickled, but this has the benefit
         # of meaning that a figure can be detached from one canvas, and
         # re-attached to another.
-        for attr_to_pop in ('show', 'canvas', '_cachedRenderer'):
+        for attr_to_pop in ('canvas', '_cachedRenderer'):
             state.pop(attr_to_pop, None)
 
         # add version information to the state
