28.02.18 16:06, Chris Angelico пише:
On Thu, Mar 1, 2018 at 12:49 AM, Serhiy Storchaka <storchaka@gmail.com> wrote:
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?
It is more readable. But can't be used as an expression.
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?
It is slightly faster (if the list is not too small). It doesn't leak a temporary variable after loop. And in many cases you don't need a list, an iterator would work as well. In these cases it is easy to just drop calling list().