Add IO helper to read and write files and standard streams

import sys

from pathlib import Path

def read(path: Path | None) -> str:

    """

    Read and return the UTF-8 encoded text contents of the file at `path`, or from stdin, if the path is None.

    """

    with path.open("r", encoding="utf-8") if path else sys.stdin as f:

        return f.read()

def write(data: str | bytes, path: Path | None) -> None:

    """

    Write the given data (either text or bytes) into the file at `path`, or to stdout, if the path is None.

    """

    if isinstance(data, str):

        with path.open("w", encoding="utf-8") if path else sys.stdout as f:

            f.write(data)

    else:

        with path.open("wb") if path else sys.stdout.buffer as f:

            f.write(data)