Question regarding a recent article on informit.com
mwilson at the-wire.com
Thu Mar 20 15:32:25 CET 2003
In article <b5cfrh$f2q$1 at newsg4.svr.pol.co.uk>,
"Ben S" <bens at replytothegroupplease.com> wrote:
>Are there any good tutorials of examples of list comprehension use? In
>particular, I'm interested in how to replicate the functionality of
>reduce? Map and filter seem easy to do, though.
Well, reduce isn't "intended" to return a list, so a list
comprehension wouldn't be a natural thing to replace it.
I mean, if you had a list of numbers to total, you might
total = reduce (add2, my_list_of_numbers)
but you wouldn't start out by writing
total = [
and fill in the rest of the line with a list comprehension.
You wouldn't intend `total` to refer to a list.
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