How to use _typeshed.wsgi with typing.get_type_hints
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Descripción
Hello there,
is there a way to get to work combination of _typeshed.wsgi and typing.get_type_hints in runtime?
In flask codebase there is something like
from __future__ import annotations
import typing as t
if t.TYPE_CHECKING: # pragma: no cover
from _typeshed.wsgi import WSGIApplication # noqa: F401
from werkzeug.datastructures import Headers # noqa: F401
from werkzeug.sansio.response import Response # noqa: F401
# The possible types that are directly convertible or are a Response object.
ResponseValue = t.Union[
"Response",
str,
bytes,
t.List[t.Any],
# Only dict is actually accepted, but Mapping allows for TypedDict.
t.Mapping[str, t.Any],
t.Iterator[str],
t.Iterator[bytes],
]
# the possible types for an individual HTTP header
# This should be a Union, but mypy doesn't pass unless it's a TypeVar.
HeaderValue = t.Union[str, t.List[str], t.Tuple[str, ...]]
# the possible types for HTTP headers
HeadersValue = t.Union[
"Headers",
t.Mapping[str, HeaderValue],
t.Sequence[t.Tuple[str, HeaderValue]],
]
# The possible types returned by a route function.
ResponseReturnValue = t.Union[
ResponseValue,
t.Tuple[ResponseValue, HeadersValue],
t.Tuple[ResponseValue, int],
t.Tuple[ResponseValue, int, HeadersValue],
"WSGIApplication",
]
https://github.com/pallets/flask/blob/3.0.0/src/flask/typing.py
and in my application I use something like
from flask.typing import ResponseReturnValue
@inject
def my_endpoint() -> ResponseReturnValue:
return "asdf"
...
def inject(method):
...
arg_types = typing.get_type_hints(method)
# get args from DI container and call actual function with injected args
which ends with error like
NameError: name 'Response' is not defined
Here is complete playground for my issue https://www.online-python.com/AsZX867MEO
I can probably use my own type for that - that's why I ask here - but not sure how to use typeshed in runtime.
Then I can probably send PR directly to flask with fix for such edge cases (as nobody probably encountered this based on how long this is in flask already).
Thanks for you tips and help in advice.
Guía de contribución
Primeros pasos
- Lee el issue completo y luego la guía de contribución del proyecto.
- Comenta en el issue que vas a ocuparte — evita que dos personas hagan lo mismo.
- Haz un fork del repositorio y trabaja en una rama.
- Abre un pull request que haga referencia al número del issue.
Línea de trabajo
Empieza por src/flask/typing.py de Flask y la llamada a typing.get_type_hints mostrada en el issue; después, reproduce el NameError usando el playground enlazado. Determina si el fallo en tiempo de ejecución corresponde a Flask o a typeshed, y documenta una resolución concreta con una prueba o ejemplo reproducible.
Escrito por el modelo de indexación a partir del texto del issue.
Evaluación
- Stack tecnológico
- flask, python
- Área
- tooling
- Tipo de issue
- Error
- Dificultad
- 4/5
- Tiempo estimado
- 3-5 días
- Estado de actividad
- Estancado
- Claridad
- Necesita aclaración
- Aptitud para principiantes
- 25/100