Python: calculate hash and save file at the same time

1-before.py

def _calculate_hash_and_save(uploaded_file, temp_file):
    file_hash = hashlib.sha256()
    for chunk in uploaded_file.chunks():
        file_hash.update(chunk)
        temp_file.write(chunk)
    return file_hash.hexdigest()

2-after.py

def hash_calculator():
    file_hash = hashlib.sha256()
    while True:
        chunk = yield
        if not chunk:
            break
        file_hash.update(chunk)
    yield file_hash.hexdigest()


def file_writer(tempfp):
    while True:
        chunk = yield
        tempfp.write(chunk)


def _calculate_hash_and_save(uploaded_file, temp_file):
    hash_coro = hash_calculator()
    next(hash_coro)

    writer_coro = file_writer(temp_file)
    next(writer_coro)

    for chunk in uploaded_file.chunks():
        hash_coro.send(chunk)
        writer_coro.send(chunk)
    file_hash = next(hash_coro)
    return file_hash