Hashing a memory-mapped file with Python

mmap_hash.py

import mmap
import xxhash

def _checksum_artifact(path: PathOrStr) -> str:
    filepath = Path(path)
    if not filepath.is_file():
        raise FileNotFoundError(str(filepath))

    h = xxhash.xxh128()
    with filepath.open("rb") as f:
        with mmap.mmap(f.fileno(), 0, prot=mmap.PROT_READ) as m:
            h.update(m)
    return h.hexdigest()