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On Mon, 25 Jan 2016 at 14:30 Andrew Barnert via Python-Dev <python-dev@python.org> wrote:

On Jan 25, 2016, at 13:43, Victor Stinner <victor.stinner@gmail.com> wrote:
\>
\> According to microbenchmarks, the most promising optimizations are
\> functions inlining (Python function calls are slow :-/) and specialize
\> the code for the type of arguments.

Can you specialize a function with a C API function, or only with bytecode? I'm not sure how much benefit you'd get out of specializing list vs. generic iterable or int vs. whatever from an AST transform, but substituting raw C code, on the other hand...

Victor's work is only manipulation of ASTs and bytecode. If you want something that low-level you need to either reach for Cython or hope a project like Pyjion pays off.