René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"CN colors look up the global prop_cycle at draw time rather than the axes' one.","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\n\r\nhttp://matplotlib.org/devdocs/tutorials/colors/colors.html states that\r\n\u003e a “CN” color spec, i.e. 'C' followed by a single digit, which is an index into the default property cycle (matplotlib.rcParams['axes.prop_cycle']); the indexing occurs at artist creation time and defaults to black if the cycle does not include color.\r\n\r\nIn particular, this implies that the lookup is *not* performed on the *Axes*' prop_cycle (but the global one), which is the actual behavior, may be a bit strange but I guess is OK.\r\nOn the other hand, the look up definitely occurs at draw time and not at artist creation time:\r\n\r\n**Code for reproduction**\r\n\r\n\u003c!--A minimum code snippet required to reproduce the bug, also minimizing the number of dependencies required--\u003e\r\n\r\n```python\r\nfrom pylab import *\r\n\r\ngca().set_axis_off()\r\nl, = plt.plot([1, 2], c=\"C0\")\r\nrcParams[\"axes.prop_cycle\"] = cycler(color=[\"r\", \"g\", \"b\"])\r\nprint(l.get_color())\r\nshow()\r\n```\r\n\r\n**Actual outcome**\r\n\r\noutputs 'C0' and a *red* line, not a tab:blue one.\r\n\r\n**Expected outcome**\r\n\r\nWe need to discuss whether the doc is wrong or the behavior is wrong...\r\n\r\n**Matplotlib version**\r\n\u003c!--Please specify your platform and versions of the relevant libraries you are using:--\u003e\r\n  * Operating system:\r\n  * Matplotlib version: master (there was some refactoring in #6382 but looking at the diff it is clear that the current behavior was already present earlier).\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`):\r\n  * Python version:\r\n  * Jupyter version (if applicable):\r\n  * Other libraries: \r\n\r\n\u003c!--Please tell us how you installed matplotlib and python e.g., from source, pip, conda--\u003e\r\n\u003c!--If you installed from conda, please specify which channel you used if not the default--\u003e\r\n\r\n","author":{"url":"https://github.com/anntzer","@type":"Person","name":"anntzer"},"datePublished":"2017-11-23T21:51:34.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/9842/matplotlib/issues/9842"}