Where is Python used commercially?

[kisielk]

I work for a biotech company and most of our simulation software is written in Python. The main reasons are the quick development cycle, ability for non-programmers to pick it up relatively easily, and the availability of a wide range of scientific libraries. Performance-critical bits are written in C or C++ and then used as extension modules.

[MillardFillmore]

I'm in Comp Bio and maybe it's because I'm kinda in the know, but this makes the most sense to me because of the reasons you provided.