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Implement itertools.groupby()
Original idea by Guido van Rossum. Idea for skipable inner iterators by Raymond Hettinger. Idea for argument order and identity function default by Alex Martelli. Implementation by Hye-Shik Chang (with tweaks by Raymond Hettinger).
This commit is contained in:
Raymond Hettinger
parent
b8d5f245b7
commit
d25c1c6351
@ -130,6 +130,54 @@ by functions or loops that truncate the stream.
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\end{verbatim}
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\end{funcdesc}
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\begin{funcdesc}{groupby}{iterable\optional{, key}}
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Make an iterator that returns consecutive keys and groups from the
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\var{iterable}. \var{key} is function computing a key value for each
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element. If not specified or is \code{None}, \var{key} defaults to an
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identity function (returning the element unchanged). Generally, the
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iterable needs to already be sorted on the same key function.
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The returned group is itself an iterator that shares the underlying
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iterable with \function{groupby()}. Because the source is shared, when
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the \function{groupby} object is advanced, the previous group is no
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longer visible. So, if that data is needed later, it should be stored
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as a list:
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\begin{verbatim}
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groups = []
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uniquekeys = []
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for k, g in groupby(data, keyfunc):
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groups.append(list(g)) # Store group iterator as a list
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uniquekeys.append(k)
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\end{verbatim}
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\function{groupby()} is equivalent to:
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\begin{verbatim}
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class groupby(object):
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def __init__(self, iterable, key=None):
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if key is None:
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key = lambda x: x
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self.keyfunc = key
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self.it = iter(iterable)
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self.tgtkey = self.currkey = self.currvalue = xrange(0)
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def __iter__(self):
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return self
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def next(self):
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while self.currkey == self.tgtkey:
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self.currvalue = self.it.next() # Exit on StopIteration
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self.currkey = self.keyfunc(self.currvalue)
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self.tgtkey = self.currkey
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return (self.currkey, self._grouper(self.tgtkey))
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def _grouper(self, tgtkey):
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while self.currkey == tgtkey:
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yield self.currvalue
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self.currvalue = self.it.next() # Exit on StopIteration
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self.currkey = self.keyfunc(self.currvalue)
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\end{verbatim}
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\versionadded{2.4}
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\end{funcdesc}
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\begin{funcdesc}{ifilter}{predicate, iterable}
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Make an iterator that filters elements from iterable returning only
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those for which the predicate is \code{True}.
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@ -346,6 +394,18 @@ Martin
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Walter
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Samuele
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# Show a dictionary sorted and grouped by value
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>>> from operator import itemgetter
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>>> d = dict(a=1, b=2, c=1, d=2, e=1, f=2, g=3)
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>>> di = list.sorted(d.iteritems(), key=itemgetter(1))
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>>> for k, g in groupby(di, key=itemgetter(1)):
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... print k, map(itemgetter(0), g)
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...
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1 ['a', 'c', 'e']
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2 ['b', 'd', 'f']
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3 ['g']
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\end{verbatim}
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This section shows how itertools can be combined to create other more
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@ -61,6 +61,94 @@ class TestBasicOps(unittest.TestCase):
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self.assertRaises(TypeError, cycle, 5)
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self.assertEqual(list(islice(cycle(gen3()),10)), [0,1,2,0,1,2,0,1,2,0])
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def test_groupby(self):
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# Check whether it accepts arguments correctly
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self.assertEqual([], list(groupby([])))
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self.assertEqual([], list(groupby([], key=id)))
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self.assertRaises(TypeError, list, groupby('abc', []))
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self.assertRaises(TypeError, groupby, None)
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# Check normal input
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s = [(0, 10, 20), (0, 11,21), (0,12,21), (1,13,21), (1,14,22),
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(2,15,22), (3,16,23), (3,17,23)]
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dup = []
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for k, g in groupby(s, lambda r:r[0]):
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for elem in g:
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self.assertEqual(k, elem[0])
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dup.append(elem)
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self.assertEqual(s, dup)
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# Check nested case
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dup = []
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for k, g in groupby(s, lambda r:r[0]):
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for ik, ig in groupby(g, lambda r:r[2]):
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for elem in ig:
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self.assertEqual(k, elem[0])
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self.assertEqual(ik, elem[2])
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dup.append(elem)
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self.assertEqual(s, dup)
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# Check case where inner iterator is not used
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keys = [k for k, g in groupby(s, lambda r:r[0])]
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expectedkeys = set([r[0] for r in s])
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self.assertEqual(set(keys), expectedkeys)
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self.assertEqual(len(keys), len(expectedkeys))
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# Exercise pipes and filters style
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s = 'abracadabra'
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# sort s | uniq
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r = [k for k, g in groupby(list.sorted(s))]
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self.assertEqual(r, ['a', 'b', 'c', 'd', 'r'])
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# sort s | uniq -d
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r = [k for k, g in groupby(list.sorted(s)) if list(islice(g,1,2))]
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self.assertEqual(r, ['a', 'b', 'r'])
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# sort s | uniq -c
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r = [(len(list(g)), k) for k, g in groupby(list.sorted(s))]
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self.assertEqual(r, [(5, 'a'), (2, 'b'), (1, 'c'), (1, 'd'), (2, 'r')])
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# sort s | uniq -c | sort -rn | head -3
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r = list.sorted([(len(list(g)) , k) for k, g in groupby(list.sorted(s))], reverse=True)[:3]
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self.assertEqual(r, [(5, 'a'), (2, 'r'), (2, 'b')])
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# iter.next failure
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class ExpectedError(Exception):
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pass
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def delayed_raise(n=0):
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for i in range(n):
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yield 'yo'
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raise ExpectedError
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def gulp(iterable, keyp=None, func=list):
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return [func(g) for k, g in groupby(iterable, keyp)]
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# iter.next failure on outer object
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self.assertRaises(ExpectedError, gulp, delayed_raise(0))
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# iter.next failure on inner object
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self.assertRaises(ExpectedError, gulp, delayed_raise(1))
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# __cmp__ failure
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class DummyCmp:
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def __cmp__(self, dst):
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raise ExpectedError
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s = [DummyCmp(), DummyCmp(), None]
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# __cmp__ failure on outer object
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self.assertRaises(ExpectedError, gulp, s, func=id)
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# __cmp__ failure on inner object
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self.assertRaises(ExpectedError, gulp, s)
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# keyfunc failure
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def keyfunc(obj):
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if keyfunc.skip > 0:
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keyfunc.skip -= 1
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return obj
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else:
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raise ExpectedError
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# keyfunc failure on outer object
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keyfunc.skip = 0
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self.assertRaises(ExpectedError, gulp, [None], keyfunc)
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keyfunc.skip = 1
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self.assertRaises(ExpectedError, gulp, [None, None], keyfunc)
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def test_ifilter(self):
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self.assertEqual(list(ifilter(isEven, range(6))), [0,2,4])
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self.assertEqual(list(ifilter(None, [0,1,0,2,0])), [1,2])
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@ -268,7 +356,7 @@ class TestBasicOps(unittest.TestCase):
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def test_StopIteration(self):
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self.assertRaises(StopIteration, izip().next)
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for f in (chain, cycle, izip):
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for f in (chain, cycle, izip, groupby):
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self.assertRaises(StopIteration, f([]).next)
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self.assertRaises(StopIteration, f(StopNow()).next)
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@ -426,6 +514,14 @@ class TestVariousIteratorArgs(unittest.TestCase):
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self.assertRaises(TypeError, list, cycle(N(s)))
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self.assertRaises(ZeroDivisionError, list, cycle(E(s)))
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def test_groupby(self):
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for s in (range(10), range(0), range(1000), (7,11), xrange(2000,2200,5)):
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for g in (G, I, Ig, S, L, R):
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self.assertEqual([k for k, sb in groupby(g(s))], list(g(s)))
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self.assertRaises(TypeError, groupby, X(s))
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self.assertRaises(TypeError, list, groupby(N(s)))
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self.assertRaises(ZeroDivisionError, list, groupby(E(s)))
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def test_ifilter(self):
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for s in (range(10), range(0), range(1000), (7,11), xrange(2000,2200,5)):
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for g in (G, I, Ig, S, L, R):
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@ -571,6 +667,16 @@ Martin
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Walter
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Samuele
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>>> from operator import itemgetter
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>>> d = dict(a=1, b=2, c=1, d=2, e=1, f=2, g=3)
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>>> di = list.sorted(d.iteritems(), key=itemgetter(1))
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>>> for k, g in groupby(di, itemgetter(1)):
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... print k, map(itemgetter(0), g)
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...
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1 ['a', 'c', 'e']
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2 ['b', 'd', 'f']
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3 ['g']
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>>> def take(n, seq):
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... return list(islice(seq, n))
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@ -164,6 +164,11 @@ Extension modules
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SF bug #812202). Generators that do not define genrandbits() now
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issue a warning when randrange() is called with a range that large.
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- itertools has a new function, groupby() for aggregating iterables
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into groups sharing the same key (as determined by a key function).
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It offers some of functionality of SQL's groupby keyword and of
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the Unix uniq filter.
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- itertools now has a new function, tee() which produces two independent
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iterators from a single iterable.
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@ -7,6 +7,323 @@
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All rights reserved.
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*/
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/* groupby object ***********************************************************/
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typedef struct {
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PyObject_HEAD
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PyObject *it;
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PyObject *keyfunc;
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PyObject *tgtkey;
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PyObject *currkey;
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PyObject *currvalue;
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} groupbyobject;
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static PyTypeObject groupby_type;
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static PyObject *_grouper_create(groupbyobject *, PyObject *);
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static PyObject *
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groupby_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
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{
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static char *kwargs[] = {"iterable", "key", NULL};
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groupbyobject *gbo;
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PyObject *it, *keyfunc = Py_None;
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if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|O:groupby", kwargs,
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&it, &keyfunc))
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return NULL;
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gbo = (groupbyobject *)type->tp_alloc(type, 0);
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if (gbo == NULL)
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return NULL;
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gbo->tgtkey = NULL;
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gbo->currkey = NULL;
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gbo->currvalue = NULL;
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gbo->keyfunc = keyfunc;
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Py_INCREF(keyfunc);
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gbo->it = PyObject_GetIter(it);
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if (gbo->it == NULL) {
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Py_DECREF(gbo);
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return NULL;
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}
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return (PyObject *)gbo;
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}
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static void
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groupby_dealloc(groupbyobject *gbo)
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{
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PyObject_GC_UnTrack(gbo);
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Py_XDECREF(gbo->it);
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Py_XDECREF(gbo->keyfunc);
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Py_XDECREF(gbo->tgtkey);
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Py_XDECREF(gbo->currkey);
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Py_XDECREF(gbo->currvalue);
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gbo->ob_type->tp_free(gbo);
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}
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static int
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groupby_traverse(groupbyobject *gbo, visitproc visit, void *arg)
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{
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int err;
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if (gbo->it) {
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err = visit(gbo->it, arg);
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if (err)
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return err;
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}
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if (gbo->keyfunc) {
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err = visit(gbo->keyfunc, arg);
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if (err)
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return err;
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}
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if (gbo->tgtkey) {
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err = visit(gbo->tgtkey, arg);
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if (err)
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return err;
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}
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if (gbo->currkey) {
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err = visit(gbo->currkey, arg);
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if (err)
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return err;
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}
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if (gbo->currvalue) {
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err = visit(gbo->currvalue, arg);
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if (err)
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return err;
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}
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return 0;
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}
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static PyObject *
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groupby_next(groupbyobject *gbo)
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{
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PyObject *newvalue, *newkey, *r, *grouper;
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/* skip to next iteration group */
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for (;;) {
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if (gbo->currkey == NULL)
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/* pass */;
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else if (gbo->tgtkey == NULL)
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break;
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else {
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int rcmp;
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rcmp = PyObject_RichCompareBool(gbo->tgtkey,
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gbo->currkey, Py_EQ);
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if (rcmp == -1)
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return NULL;
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else if (rcmp == 0)
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break;
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}
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newvalue = PyIter_Next(gbo->it);
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if (newvalue == NULL)
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return NULL;
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if (gbo->keyfunc == Py_None) {
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newkey = newvalue;
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Py_INCREF(newvalue);
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} else {
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newkey = PyObject_CallFunctionObjArgs(gbo->keyfunc,
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newvalue, NULL);
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if (newkey == NULL) {
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Py_DECREF(newvalue);
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return NULL;
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}
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}
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Py_XDECREF(gbo->currkey);
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gbo->currkey = newkey;
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Py_XDECREF(gbo->currvalue);
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gbo->currvalue = newvalue;
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}
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Py_XDECREF(gbo->tgtkey);
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gbo->tgtkey = gbo->currkey;
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Py_INCREF(gbo->currkey);
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grouper = _grouper_create(gbo, gbo->tgtkey);
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if (grouper == NULL)
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return NULL;
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r = PyTuple_Pack(2, gbo->currkey, grouper);
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Py_DECREF(grouper);
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return r;
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}
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PyDoc_STRVAR(groupby_doc,
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"groupby(iterable[, keyfunc]) -> create an iterator which returns\n\
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(key, sub-iterator) grouped by each value of key(value).\n");
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static PyTypeObject groupby_type = {
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PyObject_HEAD_INIT(NULL)
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0, /* ob_size */
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"itertools.groupby", /* tp_name */
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sizeof(groupbyobject), /* tp_basicsize */
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0, /* tp_itemsize */
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/* methods */
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(destructor)groupby_dealloc, /* tp_dealloc */
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0, /* tp_print */
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0, /* tp_getattr */
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0, /* tp_setattr */
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0, /* tp_compare */
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0, /* tp_repr */
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0, /* tp_as_number */
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0, /* tp_as_sequence */
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0, /* tp_as_mapping */
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0, /* tp_hash */
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0, /* tp_call */
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0, /* tp_str */
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PyObject_GenericGetAttr, /* tp_getattro */
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0, /* tp_setattro */
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0, /* tp_as_buffer */
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Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC |
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Py_TPFLAGS_BASETYPE, /* tp_flags */
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groupby_doc, /* tp_doc */
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(traverseproc)groupby_traverse, /* tp_traverse */
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0, /* tp_clear */
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0, /* tp_richcompare */
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0, /* tp_weaklistoffset */
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PyObject_SelfIter, /* tp_iter */
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(iternextfunc)groupby_next, /* tp_iternext */
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0, /* tp_methods */
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0, /* tp_members */
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0, /* tp_getset */
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0, /* tp_base */
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0, /* tp_dict */
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0, /* tp_descr_get */
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0, /* tp_descr_set */
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0, /* tp_dictoffset */
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0, /* tp_init */
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0, /* tp_alloc */
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groupby_new, /* tp_new */
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PyObject_GC_Del, /* tp_free */
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};
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/* _grouper object (internal) ************************************************/
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typedef struct {
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PyObject_HEAD
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PyObject *parent;
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PyObject *tgtkey;
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} _grouperobject;
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static PyTypeObject _grouper_type;
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static PyObject *
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_grouper_create(groupbyobject *parent, PyObject *tgtkey)
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{
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_grouperobject *igo;
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igo = PyObject_New(_grouperobject, &_grouper_type);
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if (igo == NULL)
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return NULL;
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igo->parent = (PyObject *)parent;
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Py_INCREF(parent);
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igo->tgtkey = tgtkey;
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Py_INCREF(tgtkey);
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return (PyObject *)igo;
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}
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static void
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_grouper_dealloc(_grouperobject *igo)
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{
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Py_DECREF(igo->parent);
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Py_DECREF(igo->tgtkey);
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PyObject_Del(igo);
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}
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static PyObject *
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_grouper_next(_grouperobject *igo)
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{
|
||||
groupbyobject *gbo = (groupbyobject *)igo->parent;
|
||||
PyObject *newvalue, *newkey, *r;
|
||||
int rcmp;
|
||||
|
||||
if (gbo->currvalue == NULL) {
|
||||
newvalue = PyIter_Next(gbo->it);
|
||||
if (newvalue == NULL)
|
||||
return NULL;
|
||||
|
||||
if (gbo->keyfunc == Py_None) {
|
||||
newkey = newvalue;
|
||||
Py_INCREF(newvalue);
|
||||
} else {
|
||||
newkey = PyObject_CallFunctionObjArgs(gbo->keyfunc,
|
||||
newvalue, NULL);
|
||||
if (newkey == NULL) {
|
||||
Py_DECREF(newvalue);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
|
||||
assert(gbo->currkey == NULL);
|
||||
gbo->currkey = newkey;
|
||||
gbo->currvalue = newvalue;
|
||||
}
|
||||
|
||||
assert(gbo->currkey != NULL);
|
||||
rcmp = PyObject_RichCompareBool(igo->tgtkey, gbo->currkey, Py_EQ);
|
||||
if (rcmp <= 0)
|
||||
/* got any error or current group is end */
|
||||
return NULL;
|
||||
|
||||
r = gbo->currvalue;
|
||||
gbo->currvalue = NULL;
|
||||
Py_DECREF(gbo->currkey);
|
||||
gbo->currkey = NULL;
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
static PyTypeObject _grouper_type = {
|
||||
PyObject_HEAD_INIT(NULL)
|
||||
0, /* ob_size */
|
||||
"itertools._grouper", /* tp_name */
|
||||
sizeof(_grouperobject), /* tp_basicsize */
|
||||
0, /* tp_itemsize */
|
||||
/* methods */
|
||||
(destructor)_grouper_dealloc, /* tp_dealloc */
|
||||
0, /* tp_print */
|
||||
0, /* tp_getattr */
|
||||
0, /* tp_setattr */
|
||||
0, /* tp_compare */
|
||||
0, /* tp_repr */
|
||||
0, /* tp_as_number */
|
||||
0, /* tp_as_sequence */
|
||||
0, /* tp_as_mapping */
|
||||
0, /* tp_hash */
|
||||
0, /* tp_call */
|
||||
0, /* tp_str */
|
||||
PyObject_GenericGetAttr, /* tp_getattro */
|
||||
0, /* tp_setattro */
|
||||
0, /* tp_as_buffer */
|
||||
Py_TPFLAGS_DEFAULT, /* tp_flags */
|
||||
0, /* tp_doc */
|
||||
0, /* tp_traverse */
|
||||
0, /* tp_clear */
|
||||
0, /* tp_richcompare */
|
||||
0, /* tp_weaklistoffset */
|
||||
PyObject_SelfIter, /* tp_iter */
|
||||
(iternextfunc)_grouper_next, /* tp_iternext */
|
||||
0, /* tp_methods */
|
||||
0, /* tp_members */
|
||||
0, /* tp_getset */
|
||||
0, /* tp_base */
|
||||
0, /* tp_dict */
|
||||
0, /* tp_descr_get */
|
||||
0, /* tp_descr_set */
|
||||
0, /* tp_dictoffset */
|
||||
0, /* tp_init */
|
||||
0, /* tp_alloc */
|
||||
0, /* tp_new */
|
||||
PyObject_Del, /* tp_free */
|
||||
};
|
||||
|
||||
|
||||
|
||||
/* tee object and with supporting function and objects ***************/
|
||||
|
||||
/* The teedataobject pre-allocates space for LINKCELLS number of objects.
|
||||
@ -2103,6 +2420,7 @@ tee(it, n=2) --> (it1, it2 , ... itn) splits one iterator into n\n\
|
||||
chain(p, q, ...) --> p0, p1, ... plast, q0, q1, ... \n\
|
||||
takewhile(pred, seq) --> seq[0], seq[1], until pred fails\n\
|
||||
dropwhile(pred, seq) --> seq[n], seq[n+1], starting when pred fails\n\
|
||||
groupby(iterable[, keyfunc]) --> sub-iterators grouped by value of keyfunc(v)\n\
|
||||
");
|
||||
|
||||
|
||||
@ -2130,6 +2448,7 @@ inititertools(void)
|
||||
&count_type,
|
||||
&izip_type,
|
||||
&repeat_type,
|
||||
&groupby_type,
|
||||
NULL
|
||||
};
|
||||
|
||||
@ -2148,5 +2467,6 @@ inititertools(void)
|
||||
return;
|
||||
if (PyType_Ready(&tee_type) < 0)
|
||||
return;
|
||||
|
||||
if (PyType_Ready(&_grouper_type) < 0)
|
||||
return;
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user