René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug/TYP]: misc type errors","articleBody":"### Bug summary\r\n\r\nPandas uses mypy/pyright to check its internal code. We currently pin matplotlib \u003c3.8 to avoid many type errors https://github.com/pandas-dev/pandas/pull/55210 Many of these errors are definitely on pandas's side :) but a few might be bugs in matplotlib.\r\n\r\n### Code for reproduction\r\n\r\n```python\r\n# Simplified examples from pandas that trigger type errors\r\n\r\ndef format_date_labels(ax: Axes, rot) -\u003e None:\r\n    for label in ax.get_xticklabels():\r\n        label.set_ha(\"right\") # error: \"Text\" has no attribute \"set_ha\"  [attr-defined]\r\n\r\n\r\ndef test(cellText: np.ndarray):\r\n    # error: Argument \"cellText\" to \"table\" has incompatible type \"ndarray[Any, Any]\"; expected \"Sequence[Sequence[str]] | None\"  [arg-type]\r\n    # maybe use a Protocol such as Iterable?\r\n    matplotlib.table.table(ax, cellText=cellText **kwargs)\r\n\r\n\r\ndef decorate_axes(ax: Axes, freq, kwargs) -\u003e None:\r\n    # The following might just be bad pandas code\r\n    # error: \"Axes\" has no attribute \"freq\"  [attr-defined]\r\n    ax.freq = freq\r\n    xaxis = ax.get_xaxis()\r\n    xaxis.freq = freq\r\n    if not hasattr(ax, \"legendlabels\"):\r\n        ax.legendlabels = [kwargs.get(\"label\", None)]\r\n    else:\r\n        ax.legendlabels.append(kwargs.get(\"label\", None))\r\n\r\n# error: Argument 1 to \"FixedLocator\" has incompatible type \"ndarray[Any, Any]\"; expected \"Sequence[float]\"  [arg-type]\r\nFixedLocator(ax.get_xticks()) \r\n\r\n# same also for set_ylabel, maybe use a protocol for str-coercible types instead of requiring str\r\ndef test(ax: Axes, label: Hashable): # Hashable might be too wide, but str seems to strict\r\n    ax.set_xlabel(label)\r\n\r\ndef test(ax: Axes):\r\n    axes = np.array([ax])\r\n    # error: Argument 1 to \"set_ticks_props\" has incompatible type \"ndarray[Any, dtype[Any]]\"; expected \"Axes | Sequence[Axes]\"  [arg-type]\r\n    set_ticks_props(axes, **kwargs)\r\n```\r\n\r\n\r\n### Actual outcome\r\n\r\nthe above type errors\r\n\r\n### Expected outcome\r\n\r\nFewer errors, but still some errors - some of the pandas code is definitely to be blamed!\r\n\r\n### Additional information\r\n\r\n_No response_\r\n\r\n### Operating system\r\n\r\n_No response_\r\n\r\n### Matplotlib Version\r\n\r\n3.8\r\n\r\n### Matplotlib Backend\r\n\r\n_No response_\r\n\r\n### Python version\r\n\r\n_No response_\r\n\r\n### Jupyter version\r\n\r\n_No response_\r\n\r\n### Installation\r\n\r\nNone","author":{"url":"https://github.com/twoertwein","@type":"Person","name":"twoertwein"},"datePublished":"2023-09-21T14:46:14.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":14},"url":"https://github.com/26858/matplotlib/issues/26858"}