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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Bug]: \"Bad file descriptor\" raised repeatedly when plt.pause() interrupted in IPython","articleBody":"### Bug summary\n\nAs in the title.\n\n### Code for reproduction\n\n```Python\nSee command-line shell. The cells `In [1]:` and `In [2]:` are copy-pasted in the shell.\n\nPython 3.11.10 | packaged by conda-forge | (main, Oct 16 2024, 01:27:36) [GCC 13.3.0]\nType 'copyright', 'credits' or 'license' for more information\nIPython 8.31.0.dev -- An enhanced Interactive Python. Type '?' for help.\n\nIn [1]: %matplotlib\n   ...: import matplotlib\n   ...: import matplotlib.pyplot as plt\n   ...: \n   ...: plt.rcParams[\"figure.figsize\"]=(10, 7)\n   ...: plt.rcParams[\"figure.dpi\"]=144\n   ...: plt.rcParams[\"figure.facecolor\"]=\"white\"\n   ...: \n   ...: plt.ion()\nUsing matplotlib backend: qtagg\nOut[1]: \u003ccontextlib.ExitStack at 0x7eb903e4f0d0\u003e\n\nIn [2]: plt.plot([1, 2, 3],[5, 4, 6])\n   ...: plt.pause(10)\n^C---------------------------------------------------------------------------\nKeyboardInterrupt                         Traceback (most recent call last)\nCell In[2], line 2\n      1 plt.plot([1, 2, 3],[5, 4, 6])\n----\u003e 2 plt.pause(10)\n\nFile ~/.../lib/python3.11/site-packages/matplotlib/pyplot.py:756, in pause(interval)\n    754         canvas.draw_idle()\n    755     show(block=False)\n--\u003e 756     canvas.start_event_loop(interval)\n    757 else:\n    758     time.sleep(interval)\n\nFile ~/.../lib/python3.11/site-packages/matplotlib/backends/backend_qt.py:451, in FigureCanvasQT.start_event_loop(self, timeout)\n    448 if timeout \u003e 0:\n    449     _ = QtCore.QTimer.singleShot(int(timeout * 1000), event_loop.quit)\n--\u003e 451 with _allow_interrupt_qt(event_loop):\n    452     qt_compat._exec(event_loop)\n\nFile ~/.../lib/python3.11/contextlib.py:144, in _GeneratorContextManager.__exit__(self, typ, value, traceback)\n    142 if typ is None:\n    143     try:\n--\u003e 144         next(self.gen)\n    145     except StopIteration:\n    146         return False\n\nFile ~/.../lib/python3.11/site-packages/matplotlib/backend_bases.py:1672, in _allow_interrupt(prepare_notifier, handle_sigint)\n   1670 signal.signal(signal.SIGINT, old_sigint_handler)\n   1671 if handler_args is not None:\n-\u003e 1672     old_sigint_handler(*handler_args)\n\nKeyboardInterrupt: \n\n---------------------------------------------------------------------------\nOSError                                   Traceback (most recent call last)\nFile ~/.../lib/python3.11/site-packages/matplotlib/backends/backend_qt.py:166, in _allow_interrupt_qt.\u003clocals\u003e.prepare_notifier.\u003clocals\u003e._may_clear_sock()\n    158 @sn.activated.connect\n    159 def _may_clear_sock():\n    160     # Running a Python function on socket activation gives the interpreter a\n   (...)\n    163     # the wakeup.  (We need this in case set_wakeup_fd catches a signal other\n    164     # than SIGINT and we shall continue waiting.)\n    165     try:\n--\u003e 166         rsock.recv(1)\n    167     except BlockingIOError:\n    168         # This may occasionally fire too soon or more than once on Windows, so\n    169         # be forgiving about reading an empty socket.\n    170         pass\n\nOSError: [Errno 9] Bad file descriptor\n```\n\n### Actual outcome\n\nThe error is raised.\n\n### Expected outcome\n\nNo repeated `OSError`.\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\nNone","author":{"url":"https://github.com/user202729","@type":"Person","name":"user202729"},"datePublished":"2025-02-27T17:25:39.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/29688/matplotlib/issues/29688"}