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author | Raymond Hettinger <python@rcn.com> | 2008-07-30 07:27:30 (GMT) |
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committer | Raymond Hettinger <python@rcn.com> | 2008-07-30 07:27:30 (GMT) |
commit | efdf706a9fb20da82d8b600cce47a3fafb490571 (patch) | |
tree | f9844b8c8d511d30881818f81858de998c7bfefe /Doc | |
parent | 66b14de7bbea8659fb8344d250662eae5ed9d820 (diff) | |
download | cpython-efdf706a9fb20da82d8b600cce47a3fafb490571.zip cpython-efdf706a9fb20da82d8b600cce47a3fafb490571.tar.gz cpython-efdf706a9fb20da82d8b600cce47a3fafb490571.tar.bz2 |
Neaten-up the itertools recipes.
Diffstat (limited to 'Doc')
-rw-r--r-- | Doc/library/itertools.rst | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst index 13d3147..6bda2cf 100644 --- a/Doc/library/itertools.rst +++ b/Doc/library/itertools.rst @@ -645,13 +645,13 @@ which incur interpreter overhead. return izip(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 kwds = dict(fillvalue=fillvalue) return izip_longest(*args, **kwds) 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) @@ -671,10 +671,8 @@ 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 = izip(data, selectors) - filtered = ifilter(operator.itemgetter(1), decorated) - return imap(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" |