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Update the itertools.accumulate() docs.

This commit is contained in:
Raymond Hettinger 2010-12-03 02:33:53 +00:00
parent 240f112448
commit 2d93e6ee63
2 changed files with 5 additions and 5 deletions
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9
Doc/library/itertools.rst
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@ -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'

1
Lib/test/test_itertools.py
View File

@ -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