René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Can't pickle bar plots: Failed to pickle attribute \"gridline\"","articleBody":"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()`:\n\n```\nfrom matplotlib.tests.test_pickle import recursive_pickle\nfrom pylab import figure, bar\nfig = figure()\nbar(left=range(10), height=range(10))\nrecursive_pickle(fig)\n```\n\ngives:\n\n```\nLine2D((0,0),(0,1))\nFailed to pickle attribute \"gridline\" in (list/tuple item #0 in (attribute \"majorTicks\" in\n(attribute \"xaxis\" in (list/tuple item #1 in (list/tuple item #1 in (list/tuple item #0 in\n(attribute \"_elements\" in (attribute \"_axstack\" in (top level object))))))))).\n Type: \u003cclass 'matplotlib.lines.Line2D'\u003e. Traceback follows:\n---------------------------------------------------------------------------\nTypeError                                 Traceback (most recent call last)\n\u003cipython-input-9-b0c9db9f3303\u003e in \u003cmodule\u003e()\n----\u003e 1 recursive_pickle(fig)\n\n/home/mspacek/src/matplotlib/lib/matplotlib/tests/test_pickle.pyc in recursive_pickle(top_obj)\n     88 #        print('trying %s' % location)\n     89         try:\n---\u003e 90             pickle.dump(obj, BytesIO(), pickle.HIGHEST_PROTOCOL)\n     91         except Exception, err:\n     92             print(obj)\n\nTypeError: expected string or Unicode object, NoneType found\n```\n\nUsing `pickle.dump()` instead like this:\n\n```\nimport pickle\nfrom io import BytesIO\nfrom pylab import figure, bar\nfig = figure()\nbar(left=range(10), height=range(10))\npickle.dump(fig, BytesIO(), pickle.HIGHEST_PROTOCOL)\n```\n\ngives a different error:\n\n```\nPicklingError: Can't pickle \u003cbuilt-in method copy_from_bbox of tuple object at 0x3406a70\u003e:\nit's not found as __main__.copy_from_bbox\n```\n\nThis is in master on Python 2.7 on Ubuntu 12.10.\n","author":{"url":"https://github.com/mspacek","@type":"Person","name":"mspacek"},"datePublished":"2013-01-30T02:42:21.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":18},"url":"https://github.com/1719/matplotlib/issues/1719"}