a = [5, 66, 7, 8, 9, ...]
Is it possible to make an iteration instead of writing like this?
a[1] - a[0]
a[2] - a[1]
a[3] - a[2]
a[4] - a[3]
...
Thank you!
pairwise traversal of a list or tuple
Viewed 25593
6 Answers
I would recommend to use awesome more_itertools library, it has ready-to-use pairwise function:
import more_itertools
for a, b in more_itertools.pairwise([1, 2, 3, 4, 5]):
print(a, b)
# 1 2
# 2 3
# 3 4
# 4 5
It will save you from writing your own (likely buggy) implementation. For example, most of implementations on this page don't handle the case with empty iterable correctly -- generator function should never raise StopIteration, this behavior considered deprecated and causes DeprecationWarning in Python 3.6. It won't work in Python 3.7 at all.
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