I prefer Flask, but I don't do to much web dev, more interested in the API part.
For me is cleaner and easyer to maintain.
First of all, python works greate toghether with data science. Even if is a high level programming language, you have tools that can process your code in a very fast way. Second, you have python preinstalled on most linux distributions.
I like python because it does the job fast, clean and easy, no need to over complicate things.
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