[StreamBright]

https://www.python.org/doc/essays/comparisons/

"Java Python programs are generally expected to run slower than Java programs, but they also take much less time to develop. Python programs are typically 3-5 times shorter than equivalent Java programs."

I think Python performance wise a less attractive options than Java or Scala. At least according to the authors. Development time is a different question.

[Chris2048]

DEv/debug time is expensive, and there are options for python - http://quant-econ.net/py/need_for_speed.html

[lmm]

Absolutely - if I could reliably write correct code first time then Python might well be a better option. Reduced debugging time is my biggest reason for preferring Scala. In particular the ability to refactor with confidence is exponentially helpful (you can keep your APIs clean and clear, which feeds back in and helps prevent mistakes). Having the safety of a typed language without having to sacrifice any of the clarity of Python was a real revelation.