pyright reportPrivateImportUsage error with typical imports

[gitpushdashf]

I have a very simple script here:

from time import time, sleep
from typing import Iterator

from flask import Flask, Response


def main() -> None:
    app = Flask("Testing server")

    last_started = int(time())
    @app.route("/reload", methods=["GET"])
    def reload() -> Response:
        def stream() -> Iterator[str]:
            # When this is reloaded, it will actually break the connection.
            while True:
                yield f"data: {last_started}\n\n"
                sleep(1)  # pragma: nocover

        return Response(stream(), mimetype="text/event-stream")

    app.run(host="127.0.0.1", port=3001, use_reloader=True)


if __name__ == "__main__":
    main()

mypy --strict is happy with it.

However, pyright is not.

$ pyright server.py
Searching for source files
Found 1 source file
server.py
  server.py:4:26 - error: "Response" is not exported from module "flask.app"
    Import from "flask.wrappers" instead (reportPrivateImportUsage)
1 error, 0 warnings, 0 informations
Completed in 1.155sec

I was surprised, at first, thinking this was a pyright bug. But perhaps it's not?

microsoft/pyright#2639

[davidism]

Update to the latest version of Flask. If that doesn't fix it, it's a bug with pyright.

[gitpushdashf]

I'm using flask 2.1.1, which is currently the latest version.

You can see the pyright explanation here: https://github.com/microsoft/pyright/blob/main/docs/typed-libraries.md#library-interface

I wonder if it follows PEP-561 more strictly than mypy.