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| -rw-r--r-- | Doc/library/itertools.rst | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst index 7d1ec96..5cc3e08 100644 --- a/Doc/library/itertools.rst +++ b/Doc/library/itertools.rst @@ -559,3 +559,9 @@ which incur interpreter overhead. :: pending -= 1 nexts = cycle(islice(nexts, pending)) + def powerset(iterable): + "powerset('ab') --> set([]), set(['b']), set(['a']), set(['a', 'b'])" + skip = object() + for t in product(*izip(repeat(skip), iterable)): + yield set(e for e in t if e is not skip) + |