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| author | Raymond Hettinger <python@rcn.com> | 2010-12-03 02:33:53 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2010-12-03 02:33:53 (GMT) |
| commit | 2d93e6ee637f3ec62114919835a32ed009b99a0b (patch) | |
| tree | 06b053acac52d4fdc34fee5b33167f259eae3888 | |
| parent | 240f112448fa26114c261cb290706226fb09152b (diff) | |
| download | cpython-2d93e6ee637f3ec62114919835a32ed009b99a0b.zip cpython-2d93e6ee637f3ec62114919835a32ed009b99a0b.tar.gz cpython-2d93e6ee637f3ec62114919835a32ed009b99a0b.tar.bz2 | |
Update the itertools.accumulate() docs.
| -rw-r--r-- | Doc/library/itertools.rst | 9 | ||||
| -rw-r--r-- | Lib/test/test_itertools.py | 1 |
2 files changed, 5 insertions, 5 deletions
diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst index befc6be..3c9f334 100644 --- a/Doc/library/itertools.rst +++ b/Doc/library/itertools.rst @@ -46,7 +46,7 @@ Iterator Arguments Results ==================== ============================ ================================================= ============================================================= Iterator Arguments Results Example ==================== ============================ ================================================= ============================================================= -:func:`accumulate` p[, start=0] p0, p0+p1, p0+p1+p2, ... ``accumulate([1,2,3,4,5]) --> 1 3 6 10 15`` +:func:`accumulate` p p0, p0+p1, p0+p1+p2, ... ``accumulate([1,2,3,4,5]) --> 1 3 6 10 15`` :func:`chain` p, q, ... p0, p1, ... plast, q0, q1, ... ``chain('ABC', 'DEF') --> A B C D E F`` :func:`compress` data, selectors (d[0] if s[0]), (d[1] if s[1]), ... ``compress('ABCDEF', [1,0,1,0,1,1]) --> A C E F`` :func:`dropwhile` pred, seq seq[n], seq[n+1], starting when pred fails ``dropwhile(lambda x: x<5, [1,4,6,4,1]) --> 6 4 1`` @@ -84,11 +84,10 @@ The following module functions all construct and return iterators. Some provide streams of infinite length, so they should only be accessed by functions or loops that truncate the stream. -.. function:: accumulate(iterable, start=0) +.. function:: accumulate(iterable) - Make an iterator that returns accumulated sums plus the value of the *start* - parameter (which defaults to :const:`0`). Elements may be any addable type - including :class:`Decimal` or :class:`Fraction`. Equivalent to:: + Make an iterator that returns accumulated sums. Elements may be any addable + type including :class:`Decimal` or :class:`Fraction`. Equivalent to:: def accumulate(iterable): 'Return running totals' diff --git a/Lib/test/test_itertools.py b/Lib/test/test_itertools.py index b8f6eec..b744636 100644 --- a/Lib/test/test_itertools.py +++ b/Lib/test/test_itertools.py @@ -66,6 +66,7 @@ class TestBasicOps(unittest.TestCase): self.assertEqual( list(accumulate(map(typ, range(10)))), list(map(typ, [0, 1, 3, 6, 10, 15, 21, 28, 36, 45]))) + self.assertEqual(list(accumulate('abc')), ['a', 'ab', 'abc']) # works with non-numeric self.assertEqual(list(accumulate([])), []) # empty iterable self.assertEqual(list(accumulate([7])), [7]) # iterable of length one self.assertRaises(TypeError, accumulate, range(10), 5) # too many args |