René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"AttributeError: 'NoneType' object has no attribute 'canvas'","articleBody":"Removing an ax created with twinx/twiny and then adding a new one with a plot, or just setting xlim/ylim for it triggers the crash (twinx -\u003e xlim, twiny -\u003e ylim).\n\n``` python\nimport matplotlib\nmatplotlib.use('TkAgg')  # same with 'agg'\n\nimport matplotlib.pyplot as plt\n\nfig = plt.figure()\nax1 = fig.add_subplot(111)\n\nax2 = ax1.twinx()\nax2.remove()\n\nax3 = fig.add_subplot(111)\nax3.set_xlim([1, 5])\n\nplt.show()\n```\n\n``` python\nTraceback (most recent call last):\n  File \"E:\\dev\\prs\\main\\test2.py\", line 13, in \u003cmodule\u003e\n    ax3.set_xlim([1, 5])\n  File \"e:\\dev\\envs\\py34_x86\\Python\\lib\\site-packages\\matplotlib\\axes\\_base.py\", line 2783, in set_xlim\n    other.figure.canvas is not None):\nAttributeError: 'NoneType' object has no attribute 'canvas'\n```\n","author":{"url":"https://github.com/dessant","@type":"Person","name":"dessant"},"datePublished":"2015-12-11T21:26:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/5663/matplotlib/issues/5663"}