codekingpro/portable-devtools

1from __future__ import annotations2 3from typing import IO, Callable4 5 6def get_fileno(file_like: IO[str]) -> int | None:7    """Get fileno() from a file, accounting for poorly implemented file-like objects.8 9    Args:10        file_like (IO): A file-like object.11 12    Returns:13        int | None: The result of fileno if available, or None if operation failed.14    """15    fileno: Callable[[], int] | None = getattr(file_like, "fileno", None)16    if fileno is not None:17        try:18            return fileno()19        except Exception:20            # `fileno` is documented as potentially raising a OSError21            # Alas, from the issues, there are so many poorly implemented file-like objects,22            # that `fileno()` can raise just about anything.23            return None24    return None25