New submission from Serhiy Storchaka: In additional to C API functions PyTuple_Size() and PyList_Size() there are fast macros PyTuple_GET_SIZE() and PyList_GET_SIZE() for getting the size of a tuple or a list. But for dicts there is just PyDict_Size(). It is not just slower than a macro, but can return an error (actually this never happens in CPython core and extensions).
Proposed patch adds new private macro _PyDict_GET_SIZE() and makes the code using it instead of PyDict_Size(). I don't expect significant performance gain except perhaps few checks that a dict is empty. The main advantage to me is that not checking the result for error no longer looks as potential bug. ---------- components: Interpreter Core files: _PyDict_GET_SIZE.patch keywords: patch messages: 283099 nosy: haypo, inada.naoki, serhiy.storchaka priority: normal severity: normal stage: patch review status: open title: Add a macro for dict size type: enhancement versions: Python 3.7 Added file: http://bugs.python.org/file45874/_PyDict_GET_SIZE.patch _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue28959> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
