When I switched to Ruby dev-work though, my tools changed. I found myself writing a lot more scripts for things which I previously would have made a C# console app for, mostly because osx/linux make it a lot easier. Soon I started writing a little Python, and found I was just plain productive (things that might have taken me many hours would take minutes), and now it's becoming a primary language for me. I'm not sure I'd use it for the majority of my work, but it's probably my #2 language tool.
I could make a snarky comment about "you'll never go back" being correct, but I do make the occasional commit to a Python project. But honestly I'd rather deal with well-written PHP than well-written Python despite the fact that the Python language is -1 times better than PHP. Just the way my mind works.
I still love and use python quite often, but more in data analysis/manipulation projects with Jupyter - Node definitely doesn't have anything on python in that dept.
p.s., check out pandas if you're not already familiar with it.
If you need to visualize from Python without touching JS try http://bokeh.pydata.org/en/latest/