python: Replace string concatenations with f-strings.
python: Replace string concatenations with f-strings.

kou/zulip,kou/zulip,kou/zulip,andersk/zulip,andersk/zulip,rht/zulip,andersk/zulip,andersk/zulip,kou/zulip,rht/zulip,kou/zulip,rht/zulip,kou/zulip,andersk/zulip,rht/zulip,andersk/zulip,rht/zulip,zulip/zulip,rht/zulip,zulip/zulip,zulip/zulip,rht/zulip,zulip/zulip,zulip/zulip,zulip/zulip,andersk/zulip,kou/zulip,zulip/zulip