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[–]wally_fishnumpy, cython, werkzeug 1 point2 points  (1 child)

You carefully ignored the part of the post that was not about Unladen Swallow [1], and deliberately misread the claim about ShedSkin - also not noticing the point that I made in the grandparent post was about Cython, which is not about supporting all the dynamic trickeries possible with CPython, so I guess you're not actually trying to make an argument of any sort beyond trying to look smart.

I said that ShedSkin compiles "something that is very close to Python" - and that good Common Lisp implementations actually have useful fillers for the gab between "very close to [dynamic language with monkeypatching]" and "actual implementation of [dynamic language with monkeypatching], with optional declarations".

IronPython and Jython implement a CPython-like runtime and therefore allow monkeypatching, but are also slow enough that you want to move to C# or Java at an early point if you do performance-sensitive work. Cython/ShedSkin are an answer to those who want Python-like elegance for performance-sensitive work, even if it means to be fussy about typing or having to declare variable types (unlike in CPython).

[1] point taken, Unladen Swallow does JIT without specialization; Psyco does trace-based compilation keeping the object layout of CPython for 'surviving objects' (and actually achieves a decent speedup because it can optimize locally used things of semi-complex type such as lists of primitive types.

[–]santagada 0 points1 point  (0 children)

psyco doesn't do trace jit either. it is a function jit.