On Monday, 28 April 2014 at 16:22:47 UTC, Russel Winder via Digitalmars-d wrote: >Their environment is one in which Python is the only > option (long > story), so they write in Python and then optimize by using > Cython on the > CPU intensive codes. This actually works very well for them. Don't forget that pypy compiles rpython to C or llvm.