Closed
Description
I know pickling of figures (awesome!) is still experimental, but it seems bar plots have problems. recursive_pickle() seems to give a more detailed traceback than pickle.dump():
from matplotlib.tests.test_pickle import recursive_pickle
from pylab import figure, bar
fig = figure()
bar(left=range(10), height=range(10))
recursive_pickle(fig)
gives:
Line2D((0,0),(0,1))
Failed to pickle attribute "gridline" in (list/tuple item #0 in (attribute "majorTicks" in
(attribute "xaxis" in (list/tuple item #1 in (list/tuple item #1 in (list/tuple item #0 in
(attribute "_elements" in (attribute "_axstack" in (top level object))))))))).
Type: <class 'matplotlib.lines.Line2D'>. Traceback follows:
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-9-b0c9db9f3303> in <module>()
----> 1 recursive_pickle(fig)
/home/mspacek/src/matplotlib/lib/matplotlib/tests/test_pickle.pyc in recursive_pickle(top_obj)
88 # print('trying %s' % location)
89 try:
---> 90 pickle.dump(obj, BytesIO(), pickle.HIGHEST_PROTOCOL)
91 except Exception, err:
92 print(obj)
TypeError: expected string or Unicode object, NoneType found
Using pickle.dump() instead like this:
import pickle
from io import BytesIO
from pylab import figure, bar
fig = figure()
bar(left=range(10), height=range(10))
pickle.dump(fig, BytesIO(), pickle.HIGHEST_PROTOCOL)
gives a different error:
PicklingError: Can't pickle <built-in method copy_from_bbox of tuple object at 0x3406a70>:
it's not found as __main__.copy_from_bbox
This is in master on Python 2.7 on Ubuntu 12.10.