Most Python libraries, when they define a logger, will add a null handler to that logger to suppress logging from their module unless client programs explicitly define a logger.
<rdar://problem/67102367>
Created attachment 406630 [details] Patch
Committed r265716: <https://trac.webkit.org/changeset/265716> All reviewed patches have been landed. Closing bug and clearing flags on attachment 406630 [details].