Path validations not working when using from __future__ import annotations

[wardy3]

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Example Code

"""Using Typer for paths."""
from __future__ import annotations

from pathlib import Path
from typing import Annotated

import typer


def main(
    tsv: Annotated[
        Path,
        typer.Option(exists=True, readable=True, dir_okay=False, help="TSV template file"),
    ] = Path("./isilon.tsv"),
) -> None:
    """Typer testing for Path's."""
    text = tsv.read_text()
    print(f"Config file contents: {text}")  # noqa: T201


if __name__ == "__main__":
    _app = typer.Typer(add_completion=False)
    _app.command(help="hello")(main)
    _app()

Description

if you run the script above with --tsv xyz, it will crash with

╭─────────────────────────────── Traceback (most recent call last) ────────────────────────────────╮
│ /Users/wardy/Documents/EMC/gitlab.nosync/storage/crap.py:17 in main                              │
│                                                                                                  │
│   14 │   ] = Path("./isilon.tsv"),                                                               │
│   15 ) -> None:                                                                                  │
│   16 │   """Typer testing for Path's."""                                                         │
│ ❱ 17 │   text = tsv.read_text()                                                                  │
│   18 │   print(f"Config file contents: {text}")  # noqa: T201                                    │
│   19                                                                                             │
│   20                                                                                             │
│                                                                                                  │
│ ╭──────── locals ────────╮                                                                       │
│ │ tsv = PosixPath('xyz') │                                                                       │
│ ╰────────────────────────╯  

if you comment out the from __future __ ..., then it works as documented

Usage: crap.py [OPTIONS]
Try 'crap.py --help' for help.
╭─ Error ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ Invalid value for '--tsv': File 'xyz' does not exist.                                                                                                                                                                                                                                          │
╰────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

I tried this in "Click" and it seems ok.

"""See if click is broken."""
from __future__ import annotations

from pathlib import Path

import click


@click.command()
@click.option("-f", type=click.Path(exists=True))
def touch(filename: Path) -> None:
    """Print FILENAME if the file exists."""
    click.echo(click.format_filename(filename))


if __name__ == "__main__":
    touch()

Usage: crap2.py [OPTIONS]
Try 'crap2.py --help' for help.

Error: Invalid value for '-f': Path 'xyz' does not exist.

Operating System

macOS

Operating System Details

OS - 14.1.1 (23B81)

running under Fish shell

Typer Version

0.9.0

Python Version

3.11.2

Additional Context

No response

[wardy3]

seems to be related to #598

[YuriiMotov]

Fixed

typer myapp.py run --tsv xyz
Usage: typer [PATH_OR_MODULE] run [OPTIONS]
Try 'typer [PATH_OR_MODULE] run --help' for help.
╭─ Error ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ Invalid value for '--tsv' (env var: 'None'): File 'xyz' does not exist.                                                                               │
╰───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯