TypeError: ord() expected string of length 1, but int found

[Hong Hui Xiao]

 2018-09-11 16:37:30.050 4008223 ERROR dragonflow.controller.apps.dhcp File "/root/dragonflow/dragonflow/controller/apps/dhcp.py", line 129, in packet_in_handler
2018-09-11 16:37:30.050 4008223 ERROR dragonflow.controller.apps.dhcp self._handle_dhcp_request(pkt, lport, dhcp_lport)
2018-09-11 16:37:30.050 4008223 ERROR dragonflow.controller.apps.dhcp File "/root/dragonflow/dragonflow/controller/apps/dhcp.py", line 143, in _handle_dhcp_request
2018-09-11 16:37:30.050 4008223 ERROR dragonflow.controller.apps.dhcp dhcp_port)
2018-09-11 16:37:30.050 4008223 ERROR dragonflow.controller.apps.dhcp File "/root/dragonflow/dragonflow/controller/apps/dhcp.py", line 186, in _create_dhcp_response
2018-09-11 16:37:30.050 4008223 ERROR dragonflow.controller.apps.dhcp dhcp_server_address)
2018-09-11 16:37:30.050 4008223 ERROR dragonflow.controller.apps.dhcp File "/root/dragonflow/dragonflow/controller/apps/dhcp.py", line 231, in _build_dhcp_options
2018-09-11 16:37:30.050 4008223 ERROR dragonflow.controller.apps.dhcp default_opts)
2018-09-11 16:37:30.050 4008223 ERROR dragonflow.controller.apps.dhcp File "/root/dragonflow/dragonflow/controller/apps/dhcp.py", line 284, in _build_response_requested_options
2018-09-11 16:37:30.050 4008223 ERROR dragonflow.controller.apps.dhcp opt_int = ord(opt)
2018-09-11 16:37:30.050 4008223 ERROR dragonflow.controller.apps.dhcp TypeError: ord() expected string of length 1, but int found

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/601968
Committed: https://git.openstack.org/cgit/openstack/dragonflow/commit/?id=98c1553af9b8e4122d1d7cad1f28d7ea0e932326
Submitter: Zuul
Branch: master

commit 98c1553af9b8e4122d1d7cad1f28d7ea0e932326
Author: Hong Hui Xiao <email address hidden>
Date: Tue Sep 11 09:05:33 2018 +0000

    Python3 complains when iterate bytes string

    Using Python3 to iterate a bytes string, int will be presented.
    However, in Python2, str will be presented.

    Closes-Bug: #1792120
    Change-Id: Id30f5f1da989fdb71e0f9b627e875e0c41f89b30