Iterate over intervals of a list

Question

Maybe I'm too spoiled with the usual awesomeness of Python, but is there a more natural way to iterate over intervals of a list?

Instead of:

L = [12, 15, 29, 100, 239]

for i in range(len(L)-1):
    print L[i], L[i+1]

12 15
15 29
29 100
100 239

is there somthing like this:

for i, j in intervals(L): 
   print i, j

?

score 4 · Accepted Answer · edited Apr 30 '18 at 17:10

4

Yes, you can use zip:

for i, j in zip(L, L[1:]): 
   print i, j

edited Apr 30 '18 at 17:10

Basj

answered Apr 30 '18 at 17:08

Francisco

Very cool! Is there also a more "explicit" keyword (maybe in itertools or collections)? – Basj Apr 30 '18 at 17:09
@Basj there's a `pairwise` recipe in the itertools module – Francisco Apr 30 '18 at 17:10

1 Answers1