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Neaten-up the itertools recipes.

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Raymond Hettinger 2008-07-30 07:37:37 +00:00
parent fbf66bd617
commit f5a2e47ad3
2 changed files with 8 additions and 12 deletions
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10
Doc/library/itertools.rst
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@ -563,12 +563,12 @@ which incur interpreter overhead.
return zip(a, b)
def grouper(n, iterable, fillvalue=None):
"grouper(3, 'abcdefg', 'x') --> ('a','b','c'), ('d','e','f'), ('g','x','x')"
"grouper(3, 'ABCDEFG', 'x') --> ABC DEF Gxx"
args = [iter(iterable)] * n
return zip_longest(*args, fillvalue=fillvalue)
def roundrobin(*iterables):
"roundrobin('abc', 'd', 'ef') --> 'a', 'd', 'e', 'b', 'f', 'c'"
"roundrobin('ABC', 'D', 'EF') --> A D E B F C"
# Recipe credited to George Sakkis
pending = len(iterables)
nexts = cycle(iter(it).__next__ for it in iterables)
@ -588,10 +588,8 @@ which incur interpreter overhead.
yield set(x for m, x in pairs if m&n)
def compress(data, selectors):
"compress('abcdef', [1,0,1,0,1,1]) --> a c e f"
decorated = zip(data, selectors)
filtered = filter(operator.itemgetter(1), decorated)
return map(operator.itemgetter(0), filtered)
"compress('ABCDEF', [1,0,1,0,1,1]) --> A C E F"
return (d for d, s in izip(data, selectors) if s)
def combinations_with_replacement(iterable, r):
"combinations_with_replacement('ABC', 3) --> AA AB AC BB BC CC"