René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Draw not caching with macosx backend","articleBody":"Using local install of current git master - the following code works with the tkagg backend, but raises an error with the macosx backend:\r\n\r\n```\r\nimport matplotlib\r\nmatplotlib.use('macosx')\r\nimport matplotlib.pyplot as plt\r\n\r\nfig, ax = plt.subplots(1, 1)\r\nim = plt.imshow([[1, 2], [3, 4]])\r\nfig.canvas.draw()\r\nax.draw_artist(im)\r\n```\r\n\r\nError for macosx backend is:\r\n\r\n```\r\n\r\nTraceback (most recent call last):\r\n  File \"draw_artist.py\", line 8, in \u003cmodule\u003e\r\n    ax.draw_artist(im)\r\n  File \"/Users/mb312/dev_trees/matplotlib/lib/matplotlib/axes/_base.py\",\r\nline 2423, in draw_artist\r\n    raise AttributeError(msg)\r\nAttributeError: draw_artist can only be used after an initial draw\r\nwhich caches the render\r\n```\r\n\r\nIt seems to me that the previous call `fig.canvas.draw()` is the \"initial draw\" that should cache the renderer.  So, is this a bug?","author":{"url":"https://github.com/matthew-brett","@type":"Person","name":"matthew-brett"},"datePublished":"2016-12-02T04:29:03.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":5},"url":"https://github.com/7550/matplotlib/issues/7550"}