René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"scatter() does not accept gray strings anymore","articleBody":"### Bug report\r\n\r\n**Bug summary**\r\n\r\nPassing a particula gray intensity as a string seems to be broken in matplotlib 3.0, at least for the scatter() function.\r\nThis kind of argument format should (and was) possible according to documentation.\r\n\r\n**Code for reproduction**\r\n\r\n```python\r\nplt.scatter(np.arange(10), np.arange(10), c=\"0.5\")\r\n```\r\n\r\n**Actual outcome**\r\n\r\n\u003c!--The output produced by the above code, which may be a screenshot, console output, etc.--\u003e\r\n\r\n```\r\n---------------------------------------------------------------------------\r\nIndexError                                Traceback (most recent call last)\r\n\u003cipython-input-99-426550bf20a7\u003e in \u003cmodule\u003e()\r\n----\u003e 1 plt.scatter(np.arange(10), np.arange(10), c=\"0.5\")\r\n\r\n~/anaconda3/lib/python3.6/site-packages/matplotlib/pyplot.py in scatter(x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, verts, edgecolors, data, **kwargs)\r\n   2791         x=x, y=y, s=s, c=c, marker=marker, cmap=cmap, norm=norm,\r\n   2792         vmin=vmin, vmax=vmax, alpha=alpha, linewidths=linewidths,\r\n-\u003e 2793         verts=verts, edgecolors=edgecolors, data=data, **kwargs)\r\n   2794     sci(__ret)\r\n   2795     return __ret\r\n\r\n~/anaconda3/lib/python3.6/site-packages/matplotlib/__init__.py in inner(ax, data, *args, **kwargs)\r\n   1783                         \"the Matplotlib list!)\" % (label_namer, func.__name__),\r\n   1784                         RuntimeWarning, stacklevel=2)\r\n-\u003e 1785             return func(ax, *args, **kwargs)\r\n   1786 \r\n   1787         inner.__doc__ = _add_data_doc(inner.__doc__,\r\n\r\n~/anaconda3/lib/python3.6/site-packages/matplotlib/axes/_axes.py in scatter(self, x, y, s, c, marker, cmap, norm, vmin, vmax, alpha, linewidths, verts, edgecolors, **kwargs)\r\n   4187             try:  # First, does 'c' look suitable for value-mapping?\r\n   4188                 c_array = np.asanyarray(c, dtype=float)\r\n-\u003e 4189                 n_elem = c_array.shape[0]\r\n   4190                 if c_array.shape in xy_shape:\r\n   4191                     c = np.ma.ravel(c_array)\r\n\r\nIndexError: tuple index out of range\r\n```\r\n\r\n**Expected outcome**\r\n same as:\r\n```python\r\nplt.scatter(np.arange(10), np.arange(10), c=(0.5,0.5,0.5))\r\n```\r\n\r\n**Matplotlib version**\r\n  * Operating system: Linux\r\n  * Matplotlib version: 3.0\r\n  * Matplotlib backend (`print(matplotlib.get_backend())`): notebook/inline\r\n  * Python version: 3.6 (conda, default)\r\n\r\n\r\n","author":{"url":"https://github.com/gioelelm","@type":"Person","name":"gioelelm"},"datePublished":"2018-10-07T16:46:07.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/12429/matplotlib/issues/12429"}