rebaseline-server is currently not Python 3 compatible, and can be made so with a few minor modifications.
<rdar://problem/100243229>
Pull request: https://github.com/WebKit/WebKit/pull/4594
Committed 254757@main (8530532661d8): <https://commits.webkit.org/254757@main> Reviewed commits have been landed. Closing PR #4594 and removing active labels.