sum for sequences?
Steven D'Aprano
steven at REMOVE.THIS.cybersource.com.au
Wed Mar 24 22:07:24 CET 2010
On Wed, 24 Mar 2010 15:29:07 +0000, kj wrote:
> Is there a sequence-oriented equivalent to the sum built-in? E.g.:
>
> seq_sum(((1, 2), (5, 6))) --> (1, 2) + (5, 6) --> (1, 2, 5, 6)
>
> ?
Yes, sum.
help(sum) is your friend.
>>> a = range(2)
>>> b = range(3)
>>> c = range(4)
>>> sum((a, b, c), [])
[0, 1, 0, 1, 2, 0, 1, 2, 3]
Beware though that sum on lists and tuples will be fairly inefficient if
you have lots of them. You may find that this will be much more efficient:
result = []
for seq in sequences:
result.extend(seq)
--
Steven
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