Difference between consecutive elements in list [duplicate]

Answer 1

Use the recipe for pairwise from the itertools documentation:

from itertools import izip, tee
def pairwise(iterable):
    "s -> (s0,s1), (s1,s2), (s2, s3), ..."
    a, b = tee(iterable)
    next(b, None)
    return izip(a, b)

Use it like this:

>>> a = [0, 4, 10, 100]
>>> [y-x for x,y in pairwise(a)]
[4, 6, 90]