def _listen(self):
logging.info('Listening: port={}'.format(self._server_port))
- self._sock.listen()
+ # Backlog must be present for Python version < 3.5.
+ # 128 is an arbitrary number since we expect only 1 connection anyway.
+ self._sock.listen(128)
self._conn, viewer_addr = self._sock.accept()
logging.info(
'Accepted viewer: addr={}:{}'.format(viewer_addr[0], viewer_addr[1])