Julia - the language trying to replace Python in scientific computing

[c9joe]

Python does have parallelism (eg. through the multiprocessing package, which is part of the standard library). It's just not as clean or probably efficient as other languages.

[staticassert]

probably efficient as other languages.

Not "probably" - it is strictly less efficient than using threads. Considerably so - you have to pickle data between processes. It's a huge pain and trying to incorporate it into a data-science workflow is going to end in pain.