request: Fix syntax error on Xenial Python.
request: Fix syntax error on Xenial Python.

eeshangarg/zulip,eeshangarg/zulip,eeshangarg/zulip,andersk/zulip,rht/zulip,timabbott/zulip,synicalsyntax/zulip,shubhamdhama/zulip,brainwane/zulip,kou/zulip,synicalsyntax/zulip,shubhamdhama/zulip,hackerkid/zulip,shubhamdhama/zulip,brainwane/zulip,brainwane/zulip,zulip/zulip,punchagan/zulip,brainwane/zulip,showell/zulip,hackerkid/zulip,brainwane/zulip,hackerkid/zulip,showell/zulip,andersk/zulip,kou/zulip,showell/zulip,punchagan/zulip,zulip/zulip,andersk/zulip,timabbott/zulip,synicalsyntax/zulip,andersk/zulip,eeshangarg/zulip,andersk/zulip,hackerkid/zulip,hackerkid/zulip,brainwane/zulip,showell/zulip,eeshangarg/zulip,rht/zulip,punchagan/zulip,eeshangarg/zulip,shubhamdhama/zulip,zulip/zulip,synicalsyntax/zulip,rht/zulip,timabbott/zulip,rht/zulip,zulip/zulip,brainwane/zulip,zulip/zulip,hackerkid/zulip,synicalsyntax/zulip,kou/zulip,showell/zulip,eeshangarg/zulip,punchagan/zulip,punchagan/zulip,kou/zulip,punchagan/zulip,showell/zulip,zulip/zulip,synicalsyntax/zulip,andersk/zulip,shubhamdhama/zulip,rht/zulip,shubhamdhama/zulip,rht/zulip,kou/zulip,andersk/zulip,shubhamdhama/zulip,timabbott/zulip,timabbott/zulip,rht/zulip,kou/zulip,synicalsyntax/zulip,timabbott/zulip,hackerkid/zulip,zulip/zulip,punchagan/zulip,showell/zulip,timabbott/zulip,kou/zulip