Python whitespace definition

whitespace.py

import unicodedata

def is_whitespace(c: str) -> bool:
    """Detect if a character is "whitespace".

    As of 3.10, this is how CPython defines "whitespace" for string operations like `str.split`.

    Sources:
    * https://github.com/python/cpython/blob/v3.10.4/Objects/unicodeobject.c#L311-L340
    * https://github.com/python/cpython/blob/v3.10.4/Tools/unicode/makeunicodedata.py#L420-L422=
    * https://github.com/python/cpython/blob/v3.10.4/Objects/unicodetype_db.h#L6205-L6243=
    """
    if len(c) != 1:
        raise ValueError("Must be a length-one string.")
    return (
        c in {"\t", "\n", "\x0b", "\x0c", "\r", "\x1c", "\x1d", "\x1e", "\x1f", " "} or
        unicodedata.bidirectional(c) in {"WS", "B", "S"} or
        unicodedata.category == "Zs"
    )