What facilities does the interpreter currently have for extracting common subexpressions, and how would it verify in such a dynamic environment that such extractions wouldn't alter the semantics of the program? Explicit (assignment using :=) is better than implicit (by optimizations hidden to the programmer).
regards Steve Steve Holden On Mon, Apr 23, 2018 at 6:13 PM, Sven R. Kunze <srku...@mail.de> wrote: > On 23.04.2018 17:59, Steve Holden wrote: > > > While Tim's expression might look (superficially) like C, the five-line > alternative isn't exactly an inspiring example of Pythonicity, is it? > > > What about > > diff = x - x_base > if diff and gcd(diff, n) > 1: > return gcd(diff, n) > > # or > > if (x - x_base) and gcd(x - x_base, n) > 1: > return gcd(x - x_base, n) > > > > and have the interpreter handle the optimization, or apply an lru_cache? > ;-) > > Cheers, > Sven > > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: https://mail.python.org/mailman/options/python-dev/ > steve%40holdenweb.com > >
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