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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Incorrect behavior of BytesIO.write() when the size of the written data changed during writing","articleBody":"# Bug report\n\nThere is other bug similar to #143378 in the Python implementation of BytesIO.\n\nThe buffer is exported twice for the input data. First, to determine the number of bytes, so we can create a slice when overwriting BytesIO data after seeking. Second, to get the data itself. If the number of bytes different, the underlying bytearray object can be shrinked or expanded, with _moving_ bytes after the current position.\n\nSolution -- we need to use the same exported buffer `with memoryview()` for the whole writing operation. The test will be slightly more complicated variant of the tests added in #143408.\n\n@superboy-zjc, are you interesting to take this issue? It should be easy to you.\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-143629\n* gh-143872\n* gh-143878\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/serhiy-storchaka","@type":"Person","name":"serhiy-storchaka"},"datePublished":"2026-01-09T12:10:51.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/143602/cpython/issues/143602"}