How to use the kombu.utils.encoding.str_to_bytes function in kombu

def decode(self, s):
        return base64.b64decode(str_to_bytes(s))

def _put(self, queue, payload, **kwargs):
        """Put `message` onto `queue`."""
        filename = '%s_%s.%s.msg' % (int(round(monotonic() * 1000)),
                                     uuid.uuid4(), queue)
        filename = os.path.join(self.data_folder_out, filename)

        try:
            f = open(filename, 'wb')
            lock(f, LOCK_EX)
            f.write(str_to_bytes(dumps(payload)))
        except (IOError, OSError):
            raise ChannelError(
                'Cannot add file {0!r} to directory'.format(filename))
        finally:
            unlock(f)
            f.close()

def encode(self, s):
        return bytes_to_str(base64.b64encode(str_to_bytes(s)))

def _digest(self, data):
        return _digest(str_to_bytes(data)).hexdigest()

def maybe_compress(value, do_compress=False):
    if do_compress:
        return compress(str_to_bytes(value))
    return value

def b64encode(s):
    return bytes_to_str(base64encode(str_to_bytes(s)))

def get_group(self, group_hash):
        return self.database.hgetall(str_to_bytes(group_hash))

def maybe_decompress(value, do_decompress=False):
    if do_decompress:
        if str_to_bytes(value[:15]) != NO_DECOMPRESS_HEADER:
            return decompress(str_to_bytes(value))
    return value