E462 Type annotations for SharedDataMiddleware produce mypy errors in common circumstances · Issue #2958 · pallets/werkzeug · GitHub
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Type annotations for SharedDataMiddleware produce mypy errors in common circumstances #2958
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Type annotations for SharedDataMiddleware produce mypy errors in common circumstances#2958
Milestone
3.0.5
@alexdotgov2

Description

@alexdotgov2
alexdotgov2
opened on Oct 23, 2024

werkzeug/src/werkzeug/middleware/shared_data.py

Lines 102 to 113 in 5add63c

def __init__(
self,
app: WSGIApplication,
exports: (
dict[str, str | tuple[str, str]]
| t.Iterable[tuple[str, str | tuple[str, str]]]
),
disallow: None = None,
cache: bool = True,
cache_timeout: int = 60 * 60 * 12,
fallback_mimetype: str = "application/octet-stream",
) -> None:

exports is annotated as dict[str, str | tuple[str, str]] (plus the iterable case). Because dict is invariant, passing a simple dict[str, str] actually produces a mypy error! Users can work around this by manually annotating the data as dict[str, str | tuple[str, str]], but this is very unergonomic.

https://mypy-play.net/?mypy=latest&python=3.12&gist=7194ebea2b603890033453b8d735e232 is a minimal demonstration of this issue, and the recommended workaround: annotating the value as collections.Mapping instead.

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