#!/usr/local/bin/python3
 
from itertools import tee
from timeit import timeit
import random
 
def deviation(A):
    yield 0
    for i in range(len(A) - 1):
        yield abs(A[i+1] - A[i])
 
def deviation_(A):
    return [abs(A[i+1] - A[i]) for i in range(len(A) - 1)]
 
def wim(A):
    a, b = tee(A)
    next(b, None)
    return [abs(x-y) for x,y in zip(a, b)]
 
A = [random.randint(0,1000) for _ in range(999)]
 
print(timeit('list(deviation(A))', setup='from __main__ import deviation, A', number=1000))
print(timeit('deviation_(A)', setup='from __main__ import deviation_, A', number=1000))
print(timeit('wim(A)', setup='from __main__ import wim, A', number=1000))
 

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