On Thu, Mar 1, 2018 at 12:49 AM, Serhiy Storchaka <storch...@gmail.com> wrote: > 28.02.18 00:27, Chris Angelico пише: >> >> Example usage >> ============= >> >> These list comprehensions are all approximately equivalent:: >> >> # Calling the function twice >> stuff = [[f(x), f(x)] for x in range(5)] > > > The simplest equivalent of [f(x), f(x)] is [f(x)]*2. It would be worth to > use less trivial example, e.g. f(x) + x/f(x).
Sure, I'll go with that. >> # Expanding the comprehension into a loop >> stuff = [] >> for x in range(5): >> y = f(x) >> stuff.append([y, y]) >> > Other options: > > g = (f(x) for x in range(5)) > stuff = [[y, y] for y in g] That's the same as the one-liner, but with the genexp broken out. Not sure it helps much as examples go? > def g(): > for x in range(5): > y = f(x) > yield [y, y] > stuff = list(g) You're not the first to mention this, but I thought it basically equivalent to the "expand into a loop" form. Is it really beneficial to expand it, not just into a loop, but into a generator function that contains a loop? ChrisA _______________________________________________ Python-ideas mailing list Python-ideas@python.org https://mail.python.org/mailman/listinfo/python-ideas Code of Conduct: http://python.org/psf/codeofconduct/
