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Title: bpo-35540 dataclasses.asdict support defaultdict fields by kwsp · Pull Request #32056 · python/cpython · GitHub

Open Graph Title: bpo-35540 dataclasses.asdict support defaultdict fields by kwsp · Pull Request #32056 · python/cpython

X Title: bpo-35540 dataclasses.asdict support defaultdict fields by kwsp · Pull Request #32056 · python/cpython

Description: https://bugs.python.org/issue35540 dataclasses.asdict breaks when there are defaultdicts in the dataclass attributes because it assumes defaultdict and dict are the same thing, but in reality defaultdict takes a default_factory as the first argument in its constructor. Since dataclasses.asdict already supports NamedTuples, I think its fair that defaultdict, which is also in the standard library, does not break dataclasses. Test: from dataclasses import dataclass, asdict from typing import DefaultDict, List from collections import defaultdict @dataclass class C: mp: DefaultDict[str, List] dd = defaultdict(list) dd["x"].append(12) c = C(mp=dd) d = asdict(c) # throws "TypeError: first argument must be callable or None" assert d == {"mp": {"x": [12]}} https://bugs.python.org/issue35540

Open Graph Description: https://bugs.python.org/issue35540 dataclasses.asdict breaks when there are defaultdicts in the dataclass attributes because it assumes defaultdict and dict are the same thing, but in reality defau...

X Description: https://bugs.python.org/issue35540 dataclasses.asdict breaks when there are defaultdicts in the dataclass attributes because it assumes defaultdict and dict are the same thing, but in reality defau...

Opengraph URL: https://github.com/python/cpython/pull/32056

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