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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"TextIOWrapper.reconfigure() crashes if encoding is not string or None","articleBody":"# Crash report\n\n### What happened?\n\nUnlike to `TextIOWrapper` constructor, `TextIOWrapper.reconfigure()` does not check that the encoding argument is actually None or string. If it is not None, it calls `_PyUnicode_EqualToASCIIString` that only works with strings and crashes in debug build. There may be other similar errors in other arguments.\n\n```pycon\n\u003e\u003e\u003e import sys\n\u003e\u003e\u003e sys.stdout.reconfigure(encoding=42)\nObjects/unicodeobject.c:552: _PyUnicode_CheckConsistency: Assertion failed: PyType_HasFeature((Py_TYPE(((PyObject*)((op))))), ((1UL \u003c\u003c 28)))\nEnable tracemalloc to get the memory block allocation traceback\n\nobject address  : 0x55a2e3147ca8\nobject refcount : 4294967295\nobject type     : 0x55a2e3119f00\nobject type name: int\nobject repr     : 42\n\nFatal Python error: _PyObject_AssertFailed: _PyObject_AssertFailed\nPython runtime state: initialized\n\nCurrent thread 0x00007fc99ee43740 (most recent call first):\n  File \"\u003cstdin\u003e-1\", line 1 in \u003cmodule\u003e\nAborted (core dumped)\n```\n\n\n### CPython versions tested on:\n\n3.10, 3.11, 3.12\n\n### Operating systems tested on:\n\n_No response_\n\n### Output from running 'python -VV' on the command line:\n\n_No response_\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-111976\n* gh-112058\n* gh-112059\n* gh-112061\n* gh-112067\n* gh-112085\n* gh-112089\n* gh-126542\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/serhiy-storchaka","@type":"Person","name":"serhiy-storchaka"},"datePublished":"2023-11-10T10:23:22.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/111942/cpython/issues/111942"}