René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Pickling imshow fails (?due to _imcache)","articleBody":"Pickling `imshow` objects (I'm using them used for heatmaps) fails with the following error in IPython after `%matplotlib inline` magic has been used. If inline figures are not set they work as expected.\n\n```\nUnpickleableError: Cannot pickle \u003ctype 'Image'\u003e objects\n```\n\nUsing `matplotlib.tests.test_pickle.recursive_pickle` fails reporting the following (similar to #1719):\n\n```\nFailed 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: \u003cclass 'matplotlib.lines.Line2D'\u003e\n```\n\nHowever, using `matplotlib.tests.test_pickle.depth_getter` its possible to identify the object that is the cause of the initial error. It's at:\n\n```\n140628613187224 (8, \u003cImage object at 0x7fe6a688c698\u003e, u'attribute \"_imcache\" in (list/tuple item #0 in (attribute \"images\" 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))))))))')\n```\n\nIt looks as though this is a cache of the rendered image. Can these be ignored when pickling?\n","author":{"url":"https://github.com/mfitzp","@type":"Person","name":"mfitzp"},"datePublished":"2014-10-03T11:50:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/3614/matplotlib/issues/3614"}