Relax DictWriter.fieldnames closer to implementation #5994
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I think this might actually work if you pass just an Iterable, however since that would allow passing a generator (which would definitely not work correctly) I've kept this as Collection. Fix python#5993
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stdlib/csv.pyi
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| @@ -17,7 +17,7 @@ from _csv import ( | |||
| unregister_dialect as unregister_dialect, | |||
| writer as writer, | |||
| ) | |||
| from typing import Any, Generic, Iterable, Iterator, Mapping, Sequence, Type, TypeVar, overload | |||
| from typing import Any, Collection, Generic, Iterable, Iterator, Mapping, Sequence, Type, TypeVar, overload | |||
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One minor thing: We should import Collection, Iterable, Iterator, Mapping, and Sequence from collections.abc instead of typing.
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Ah, should that be changed here, or would it be preferable to do that separately? (I'd be happy to put together a subsequent PR which does these all together)
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Whatever works best for you.
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f8af7bc hopefully fixes this.
Just a thought -- would it be useful to have a flake8 plugin (custom to this repo) which checked for this? I suspect it would be fairly easy to create one and might make this preference more visible. If I recall correctly no-one would need to install anything extra, it would just be a file somewhere in the repo and some configuration in the pyproject.toml and flake8 would do the rest.
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Hrm, I'd not spotted that you can pass fieldnames to However it's optional and you can omit them and get back a Additionally passing a value is complicated by the fact that it's the passed value you get back from It feels like the right signature for Very happy to be guided on how to spell the signature for |
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According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉 |
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Thanks! |
I think this might actually work if you pass just an
Iterable, however since that would allow passing a generator (which would definitely not work correctly) I've kept this asCollection.Fixes #5993