Iterate through arraylist calculating the difference of consecutive values in python -


i'm trying iterate on arraylist saving in every loop highest/lowest difference of consecutive values. 

e1=([ 0 , 0,  0,  0, 15, 28, 28, 28, 27, 27, 35, 44, 43, 43, 42, 39]) hodiffmax = 0 hodiffmin = 0 k in e1:   diff1= e1[k+1] - e1[k]   if diff1 > hodiffmax:       hodiffmax=diff1   if diff1 < hodiffmin:       hodiffmin=diff1

the problem "index out of bound" error. how can iterate through arraylist [k+1]? tried bunch of things dont smarter. appreciate help!

edit (that works neither):

for k in e1:     w in k:       diff1= e1[w+1] - e1[w]       if diff1 > hodiffmax:           hodiffmax=diff1       if diff1 < hodiffmin:           hodiffmin=diff1

error: w in k - typeerror: 'numpy.int32' object not iterable

use grouper recipe:

def grouper(iterable, n, fillvalue=none):     "collect data fixed-length chunks or blocks"     # grouper('abcdefg', 3, 'x') --> abc def gxx     args = [iter(iterable)] * n     return izip_longest(fillvalue=fillvalue, *args)  itertools import izip_longest # required grouper = [0, 0, 0, 0, 15, 28, 28, 28, 27, 27, 35, 44, 43, 43, 42, 39] lowest = none highest = none z,q in grouper(i, 2):     v = z-q     if v < lowest:         lowest = v     if v > highest:         highest = v print(lowest) print(highest)

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