René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: Style flag errors trying to save figures as PDF with font Inter","articleBody":"### Bug summary\r\n\r\nI have installed the font Inter with `brew install font-inter` and successfully imported it into matplotlib such that the figure from the plot below displays correctly with the Inter font as specified; however, when it comes to saving, I get the error below in \"actual outcome\". \r\n\r\n### Code for reproduction\r\n\r\n```Python\r\nimport matplotlib\r\nimport matplotlib.pyplot as plt\r\nimport matplotlib.font_manager as fm\r\n\r\nmatplotlib.use(\"QtAgg\")\r\n# Ensure 'Inter' is available\r\navailable_fonts = [f.name for f in fm.fontManager.ttflist]\r\nif 'Inter' in available_fonts:\r\n    plt.rcParams['font.family'] = 'Inter'\r\nelse:\r\n    print(\"Inter font is not available. Please ensure it is installed.\")\r\n\r\n# generate a test plot and save it\r\nfig, ax = plt.subplots()\r\nax.plot([0, 1], [0, 1])\r\nax.set_title(\"Example Plot with Inter Font\")\r\nplt.show()\r\nfig.savefig(\"example_plot.pdf\", format='pdf')\r\n```\r\n\r\n\r\n### Actual outcome\r\n\r\n```\r\nTraceback (most recent call last):\r\n  File \"/Users/atom/hemanpro/HeMan/misc_tools/addfont.py\", line 18, in \u003cmodule\u003e\r\n    fig.savefig(\"example_plot.pdf\", format='pdf')\r\n    ~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/Users/atom/hemanpro/HeMan/.venv/lib/python3.13/site-packages/matplotlib/figure.py\", line 3490, in savefig\r\n    self.canvas.print_figure(fname, **kwargs)\r\n    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^\r\n  File \"/Users/atom/hemanpro/HeMan/.venv/lib/python3.13/site-packages/matplotlib/backends/backend_qtagg.py\", line 75, in print_figure\r\n    super().print_figure(*args, **kwargs)\r\n    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^\r\n  File \"/Users/atom/hemanpro/HeMan/.venv/lib/python3.13/site-packages/matplotlib/backend_bases.py\", line 2184, in print_figure\r\n    result = print_method(\r\n        filename,\r\n    ...\u003c3 lines\u003e...\r\n        bbox_inches_restore=_bbox_inches_restore,\r\n        **kwargs)\r\n  File \"/Users/atom/hemanpro/HeMan/.venv/lib/python3.13/site-packages/matplotlib/backend_bases.py\", line 2040, in \u003clambda\u003e\r\n    print_method = functools.wraps(meth)(lambda *args, **kwargs: meth(\r\n                                                                 ~~~~^\r\n        *args, **{k: v for k, v in kwargs.items() if k not in skip}))\r\n        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/Users/atom/hemanpro/HeMan/.venv/lib/python3.13/site-packages/matplotlib/backends/backend_pdf.py\", line 2789, in print_pdf\r\n    file.finalize()\r\n    ~~~~~~~~~~~~~^^\r\n  File \"/Users/atom/hemanpro/HeMan/.venv/lib/python3.13/site-packages/matplotlib/backends/backend_pdf.py\", line 827, in finalize\r\n    self.writeFonts()\r\n    ~~~~~~~~~~~~~~~^^\r\n  File \"/Users/atom/hemanpro/HeMan/.venv/lib/python3.13/site-packages/matplotlib/backends/backend_pdf.py\", line 973, in writeFonts\r\n    fonts[Fx] = self.embedTTF(filename, chars)\r\n                ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^\r\n  File \"/Users/atom/hemanpro/HeMan/.venv/lib/python3.13/site-packages/matplotlib/backends/backend_pdf.py\", line 1416, in embedTTF\r\n    sf = font.style_flags\r\n         ^^^^^^^^^^^^^^^^\r\n  File \"/opt/homebrew/Cellar/python@3.13/3.13.1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/enum.py\", line 726, in __call__\r\n    return cls.__new__(cls, value)\r\n           ~~~~~~~~~~~^^^^^^^^^^^^\r\n  File \"/opt/homebrew/Cellar/python@3.13/3.13.1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/enum.py\", line 1207, in __new__\r\n    raise exc\r\n  File \"/opt/homebrew/Cellar/python@3.13/3.13.1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/enum.py\", line 1184, in __new__\r\n    result = cls._missing_(value)\r\n  File \"/opt/homebrew/Cellar/python@3.13/3.13.1/Frameworks/Python.framework/Versions/3.13/lib/python3.13/enum.py\", line 1480, in _missing_\r\n    raise ValueError(\r\n    ...\u003c2 lines\u003e...\r\n                ))\r\nValueError: \u003cflag 'StyleFlags'\u003e invalid value 589824\r\n    given 0b0 10010000000000000000\r\n  allowed 0b0 00000000000000000011\r\n.venvFAIL\r\n```\r\n\r\n### Expected outcome\r\n\r\nThe figure is saved as a PDF with the Inter font.\r\n\r\n### Additional information\r\n\r\nThis only occurs on my macOS installation of Python 3.13.1 with matplotlib 3.10.0.\r\n\r\n### Operating system\r\n\r\nmacOS Sequoia 15.2\r\n\r\n### Matplotlib Version\r\n\r\n3.10.0\r\n\r\n### Matplotlib Backend\r\n\r\nQtAgg, cairo, macosx\r\n\r\n### Python version\r\n\r\n3.13.1\r\n\r\n### Jupyter version\r\n\r\n_No response_\r\n\r\n### Installation\r\n\r\npip","author":{"url":"https://github.com/ohshitgorillas","@type":"Person","name":"ohshitgorillas"},"datePublished":"2025-01-03T03:38:40.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/29396/matplotlib/issues/29396"}