IMHO Python killed both Perl and Ruby. While Ruby is more alive than Perl it's nowhere near as popular as Python.

I like Perl and used it professionally for year and vaguely remember probably around 2010x relatively massive Python evangelism (lots of articles, conferences, lots of messages from Python adepts on forums e.t.c). One of talking points (no longer needed nowadays) was that Python is backed (sponsored) by Google so Python will be successful and you should not worry about it's future and also if you will choose Python you will be successful (as Google is).