[Tutor] a question about list
maxnoel_fr at yahoo.fr
Fri Nov 12 00:33:02 CET 2004
On Nov 11, 2004, at 23:17, Terry Carroll wrote:
> A kludge would be to delete in right-to-left order instead:
> b_rev = b
> b_rev.sort() # b = [1, 2, 4] ; sorted just to be sure
> b_rev.reverse() # b = [4, 2, 1]
> for i in b_rev:
> del a[i]
> But that's pretty ugly. I'll bet someone has responded with a far more
> pythonic way of doing this as I've been typing.
a = [element for index, element in enumerate(a) if index not in b]
Looks a bit more Pythonic to me. I also think it's faster. However, it
uses more memory: in the "worst" case, you'll find yourself with a copy
of a in memory for a short moment. Probably not a big deal, though,
unless a is already occupying more than half your computer's memory.
maxnoel_fr at yahoo dot fr -- ICQ #85274019
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