Of course Ruby won't kill off Python. I've spent almost all of my experience using Python, and I guess Ruby and Python can each do their own unique things, but I feel like I can achieve whatever I want to do in Python.
About Ruby having a "better" syntax, that's a matter of opinion. It ultimately depends on what you like more. I don't have a problem with either of them.
Both Python and Ruby are good languages, but I see Python used more for things in general.
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