PyPy apart, we wouldn’t have to rewrite everything. It would just be simpler to add new functions written in Python.
On Mon, Dec 9, 2019 at 09:29 Andrew Barnert <abarn...@yahoo.com> wrote: > On Dec 8, 2019, at 22:01, Tim Peters <tim.pet...@gmail.com> wrote: > > > > BTW, another change I'd make is to break the tradition of coding every > > itertools function in C. That makes the implementation bar much > > higher, and the other similar packages (more_itertools, > > toolz.itertools) don't bother. There's also that pypy has trouble > > optimizing code using itertools heavily, _because_ it's written in C > > instead of Python. > > Didn’t PyPy already make the fix years ago of rewriting all of itertools > (for both 2.7 and 3.3 or whenever) as “Python builtins” in the underlying > namespace? > > Also, even if I’m remembering wrong, just writing a Python module in front > of the C module, with most of the functions still being C-only, wouldn’t > help PyPy. You’d still need to port every function to Python (and be aware > that the “equivalent code” in the help is usually only a rough equivalent > with subtle differences, so you’d have to spot, fix, and write unit tests > for all of those), with the C only an optional accelerator, a la PEP 399 > (the requirements for C accelerators in newly-added modules). > > Which is far from impossible, it’s just more work than it seems like > anyone’s ever been willing to do each time it comes up (and you’re right, > it comes up every time a new potentially useful itertools tool is > proposed…). If someone cares about first enough to finally do that, I’m +1 > on the proposal instead of 0. > > > -- --Guido (mobile)
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