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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Wrong size of c_ulong/c_ulonglong in Linux","articleBody":"# Bug report\n\n### Bug description:\n\nAttribute ```_type_``` of ```c_ulong``` returns ```L```, which is correct following the  [format characters documentation](https://docs.python.org/3.8/library/struct.html#format-characters); however, the documentation says it has 4 bytes size, but ```sizeof(c_ulong)``` returns 8 bytes. \n```python\n\u003e\u003e\u003e sizeof(c_ulong)\n8\n\u003e\u003e\u003e c_ulong._type_\n'L'\n```\nAlso ```c_ulonglong``` is automatically casted to ```c_ulong```:\n```python\nt5=c_ulonglong(200000000000000000000000000000000000)\n\u003e\u003e\u003e type(t5)\n\u003cclass 'ctypes.c_ulong'\u003e\n```\n, thus if ```c_ulong``` will have 4 bytes, will be there available a type of 8 bytes size?  \n\n\n### CPython versions tested on:\n\n3.8\n\n### Operating systems tested on:\n\nLinux\n\n\u003c!-- gh-linked-prs --\u003e\n### Linked PRs\n* gh-145837\n* gh-146328\n\u003c!-- /gh-linked-prs --\u003e\n","author":{"url":"https://github.com/dudekw","@type":"Person","name":"dudekw"},"datePublished":"2023-09-05T11:42:25.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":4},"url":"https://github.com/108907/cpython/issues/108907"}