René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Enforce that Line data modifications are sequences","articleBody":"### Bug summary\n\nIt used to be possible to use `Line2D.set_ydata` with a single scalar. From a quick search I think this behaviour was changed in #22329, and I guess it makes sense for a lot of cases. However, I don't think mandating a sequence really makes sense when `Line2D` was created by `ax.axhline`, or `ax.axvline`, because those two methods use scalars themselves, not sequences.\n\n### Code for reproduction\n\n```Python\nfig, ax = plt.subplots()\r\nl = ax.axvline(x=10)\r\nl.set_xdata(15)\n```\n\n\n### Actual outcome\n\n```\r\n---------------------------------------------------------------------------\r\nRuntimeError                              Traceback (most recent call last)\r\nCell In[8], line 4\r\n      2 fig, ax = plt.subplots()\r\n      3 l = ax.axvline(x=10)\r\n----\u003e 4 l.set_xdata(15)\r\n\r\nFile [~/miniforge3/envs/dev3/lib/python3.12/site-packages/matplotlib/lines.py:1289](http://localhost:8888/lab/tree/data/reduce/~/miniforge3/envs/dev3/lib/python3.12/site-packages/matplotlib/lines.py#line=1288), in Line2D.set_xdata(self, x)\r\n   1276 \"\"\"\r\n   1277 Set the data array for x.\r\n   1278 \r\n   (...)\r\n   1286 set_ydata\r\n   1287 \"\"\"\r\n   1288 if not np.iterable(x):\r\n-\u003e 1289     raise RuntimeError('x must be a sequence')\r\n   1290 self._xorig = copy.copy(x)\r\n   1291 self._invalidx = True\r\n\r\nRuntimeError: x must be a sequence\r\n```\n\n### Expected outcome\n\nA plot with horizontal/vertical line\n\n### Additional information\n\n_No response_\n\n### Operating system\n\n_No response_\n\n### Matplotlib Version\n\n3.9.2\n\n### Matplotlib Backend\n\n_No response_\n\n### Python version\n\n_No response_\n\n### Jupyter version\n\n_No response_\n\n### Installation\n\npip","author":{"url":"https://github.com/andyfaff","@type":"Person","name":"andyfaff"},"datePublished":"2024-10-03T04:52:52.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/28927/matplotlib/issues/28927"}