Improve urlunsplit and urlunparse
#9991
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Diff from mypy_primer, showing the effect of this PR on open source code: werkzeug (https://github.com/pallets/werkzeug)
+ src/werkzeug/routing/map.py:763: error: Unused "type: ignore[type-var]" comment
+ src/werkzeug/routing/map.py:764: error: Argument 1 to "urlunsplit" has incompatible type "Tuple[str, str, str, Union[Mapping[str, Any], str, None], None]"; expected "Iterable[None]" [arg-type]
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hauntsaninja
approved these changes
Apr 2, 2023
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urlunsplitandurlunparseis currently pointless. If you provide a tuple of a different length to these functions, type checkers simply fall back to the second overload, and don't emit an error: https://mypy-play.net/?mypy=latest&python=3.11&gist=966b9d881ce16ee67e220bff46d5f21c.strforurlunsplit((None, None, None, None, None)), but the returned value isb"": https://mypy-play.net/?mypy=latest&python=3.11&gist=dffd33f24d5e90b18cee1757d48149c6. Replace the first overload with an overload forIterable[None].Iterableinstead ofSequence, since these functions accept any iterable that can be unpacked; it doesn't have to be a sequence.