itertools (python)

itertools_notes.py

#!usr/local/env python3
# -*- coding: utf-8 -*-

import itertools

def consonant(c):
    return c.lower() not in "aeiou"
# (built-in) filter()
list(filter(consonant, 'Aartttik'))
list(itertools.filterfalse(consonant, 'Aartttik'))

# takewhile() returns the iterable until predicate(element) is False
list(itertools.takewhile(consonant, 'rrrAartttik'))
# ['r', 'r', 'r']

list(itertools.dropwhile(consonant, 'rrrAartttik'))
# ['A', 'a', 'r', 't', 't', 't', 'i', 'k']

list(itertools.islice('Aartttik', 1, 3))
# ['a', 'r']

# accumulate(it, fun)
list(itertools.accumulate([8, 3, 5, 7]))
# [8, 11, 16, 23]

list(itertools.accumulate([8, 3, 5, 7], max))
# [8, 8, 8, 8]