New submission from Moshe Morad <moshemorad12340@gmail.com>: How to reproduce ----------------

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from collections import defaultdict dd = defaultdict(default_factory=list) dd defaultdict(None, {'default_factory': <class 'list'>}) print(dd.default_factory) None

Analysis -------- defdict_init(PyObject *self, PyObject *args, PyObject *kwds) function that initializing defaultdict object ignores the kwds and pass them to the dict init only. Expect: ------- Since we can understand why we want to move kwds to dict without modification consider at least adding comment in the docstring or enforce it as positional argument only. ---------- assignee: docs@python components: Documentation, ctypes messages: 375823 nosy: docs@python, moshemorad12340 priority: normal severity: normal status: open title: defaultdict miss behave when using default_factory passed as kwargs type: behavior versions: Python 3.8 _______________________________________ Python tracker <report@bugs.python.org> <https://bugs.python.org/issue41621> _______________________________________