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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"traceback.print_last behaving differently across python versions","articleBody":"# Bug report\n\n### Bug description:\n\n`traceback.print_last()` correctly prints the latest traceback for python 3.10.16 and 3.11.9, but it prints `NoneType: None` for 3.12.9 and 3.13.2\n\nSee also https://github.com/ipython/ipython/issues/14744, I originally thought it was an ipython issue\n\n```\nPython 3.10.16 (main, Feb 13 2025, 14:32:36) [GCC 11.4.0] on linux\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n\u003e\u003e\u003e 1/0\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nZeroDivisionError: division by zero\n\u003e\u003e\u003e import traceback\n\u003e\u003e\u003e traceback.print_last()\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nZeroDivisionError: division by zero\n```\n\n```\nPython 3.11.9 (main, Feb 13 2025, 14:34:41) [GCC 11.4.0] on linux\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n\u003e\u003e\u003e 1/0\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nZeroDivisionError: division by zero\n\u003e\u003e\u003e import traceback\n\u003e\u003e\u003e traceback.print_last()\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nZeroDivisionError: division by zero\n```\n\n```\nPython 3.12.9 (main, Feb 13 2025, 13:23:03) [GCC 11.4.0] on linux\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n\u003e\u003e\u003e 1/0\nTraceback (most recent call last):\n  File \"\u003cstdin\u003e\", line 1, in \u003cmodule\u003e\nZeroDivisionError: division by zero\n\u003e\u003e\u003e import traceback\n\u003e\u003e\u003e traceback.print_last()\nNoneType: None\n```\n\n```\nPython 3.13.2 (main, Feb 13 2025, 11:10:27) [GCC 11.4.0] on linux\nType \"help\", \"copyright\", \"credits\" or \"license\" for more information.\n\u003e\u003e\u003e 1/0\nTraceback (most recent call last):\n  File \"\u003cpython-input-0\u003e\", line 1, in \u003cmodule\u003e\n    1/0\n    ~^~\nZeroDivisionError: division by zero\n\u003e\u003e\u003e import traceback\n\u003e\u003e\u003e traceback.print_last()\nNoneType: None\n```\n\n\n### CPython versions tested on:\n\n3.10, 3.11, 3.12, 3.13\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-130318\n* gh-130325\n* gh-130326\n* gh-130329\n* gh-130330\n* gh-130331\n* gh-130342\n* gh-130344\n* gh-130345\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/mironleon","@type":"Person","name":"mironleon"},"datePublished":"2025-02-18T08:42:51.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/130250/cpython/issues/130250"}