human
I wrote the below code

    if (outf is None):
        outf = getattr(sys.stdout, 'buffer', sys.stdout)
    if (inf is None):
        inf = getattr(sys.stdin, 'buffer', sys.stdin)
    path = os.path.expanduser(path)
    backend = FileSystemBackend(path)
    def send_fn(data):
        outf.write(data)
        outf.flush()
    proto = Protocol(inf.read, send_fn)
    handler = UploadPackHandler(backend, [path], proto)
    handler.handle()
    return 0

What's a good function header?
assistant
#Here's a good function header.

def upload_pack(path='.', inf=None, outf=None):