diff options
Diffstat (limited to 'Doc/library')
| -rw-r--r-- | Doc/library/itertools.rst | 24 |
1 files changed, 12 insertions, 12 deletions
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst index 05f1874..d8faba7 100644 --- a/Doc/library/itertools.rst +++ b/Doc/library/itertools.rst @@ -401,17 +401,6 @@ can be combined. :: 27 64 - >>> reportlines = ['EuroPython', 'Roster', '', 'alex', '', 'laura', - ... '', 'martin', '', 'walter', '', 'mark'] - >>> for name in islice(reportlines, 3, None, 2): - ... print name.title() - ... - Alex - Laura - Martin - Walter - Mark - # Show a dictionary sorted and grouped by value >>> from operator import itemgetter >>> d = dict(a=1, b=2, c=1, d=2, e=1, f=2, g=3) @@ -534,5 +523,16 @@ which incur interpreter overhead. :: "grouper(3, 'abcdefg', 'x') --> ('a','b','c'), ('d','e','f'), ('g','x','x')" return izip(*[chain(iterable, repeat(padvalue, n-1))]*n) - + def roundrobin(*iterables): + "roundrobin('abc', 'd', 'ef') --> 'a', 'd', 'e', 'b', 'f', 'c'" + # Recipe contributed by George Sakkis + pending = len(iterables) + nexts = cycle(iter(it).next for it in iterables) + while pending: + try: + for next in nexts: + yield next() + except StopIteration: + pending -= 1 + nexts = cycle(islice(nexts, pending)) |