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itertools.islice in Python

Creates an iterator over a limited subset of the elements of the passed object.

itertools.islice (iterable, [start], stop [, step])

-> iterator

iiterable - The object to get the subset from.

start = None - Integer. The index of the starting element of the subset. Starting with py2.5, None is treated as 0.

stop - Integer. The index of the ending element of the subset. If None, then all remaining elements are returned.

step = None - Integer. The step to go through the subset. Since + py2.5, None is interpreted as 1.


Unlike usual slice , this function does not support negative values ​​in start , stop , step

  from itertools import islice 
letters = ’ABCDEFG’

list (islice (letters, 2 )) # [’ A’,’ B’]
list (islice (letters, 2, 4)) # [’C’,’ D’]
list (islice (letters, 2, None)) # [’C’,’ D’, ’E’,’ F’, ’G’]
list (islice (letters, 0, None, 2)) # [’ A’, ’C’,’ E ’,’ G’]

itertools.islice in Python islice: Questions

itertools.islice in Python Python functions: Questions


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