Add recipe using itertools.product().

7832d4d5 · Raymond Hettinger · 532316df · 7832d4d5
Commit 7832d4d5 authored Feb 23, 2008 by Raymond Hettinger
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Doc/library/itertools.rst Doc/library/itertools.rst +6 -0

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--- 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)