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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Missing type hints for `matplotlib.dates.DateFormatter`","articleBody":"Using this code:\n\n```py\nfrom matplotlib.dates import DateFormatter\n\ndate_fmt = \"%H:%M:%S\"\ndate_formatter = DateFormatter(date_fmt)\n```\n\nRunning Mypy in `strict` mode results in an erorr:\n\n```\n$ mypy --strict main.py \nmain.py:4: error: Call to untyped function \"DateFormatter\" in typed context  [no-untyped-call]\nFound 1 error in 1 file (checked 1 source file)\n```\n\nWe run Mypy in `strict` mode across all of our code base to catch programming errors and would like to use it with matplotlib without the need to suppress errors like this.\n\n### Environment\n\n- Python 3.11.11\n- matplotlib 3.10.1\n- mypy 1.15.0\n\n### Related References\n\n- #20504\n- #24976","author":{"url":"https://github.com/johnthagen","@type":"Person","name":"johnthagen"},"datePublished":"2025-05-01T12:28:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/29994/matplotlib/issues/29994"}