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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
The newest version!
"""Misc iterator tests.
Made for Jython.
"""
import itertools
import operator
from test import test_support
import unittest
class IterTestCase(unittest.TestCase):
def test_fastiter(self):
class MyList(list):
def __getitem__(self, index):
return str(index) + '!'
class MyTuple(tuple):
def __getitem__(self, index):
return str(index) + '!'
self.assertEqual(iter(MyList(['a', 'b'])).next(), 'a')
self.assertEqual(iter(MyTuple(['a', 'b'])).next(), 'a')
def test_slowiter(self):
class MyStr(str):
def __getitem__(self, index):
return str(index) + '!'
self.assertEqual(iter(MyStr('ab')).next(), '0!')
def test_chain(self):
self.assertEqual(list(itertools.chain([], [], ['foo'])), ['foo'])
class ChainedIterationTest(unittest.TestCase):
# Test http://bugs.jython.org/issue1991
def test_chain(self):
class TestChain(object):
def __init__(self, data):
self.data = data
def __iter__(self):
return itertools.chain(self.data)
data = [1, 2, 3]
obj = TestChain(data)
self.assertEqual(list(obj), data)
self.assertEqual(list(obj), list(obj.__iter__()))
def test_compress(self):
class TestCount(object):
def __init__(self, data, selectors):
self.data = data
self.selectors = selectors
def __iter__(self):
return itertools.compress(self.data, self.selectors)
obj = TestCount((1, 2, 3, 4, 5), (1, 0, 1, 0, 1))
self.assertEqual(list(obj), [1, 3, 5])
self.assertEqual(list(obj), list(obj.__iter__()))
def test_count(self):
class TestCount(object):
def __init__(self, data):
self.data = data
def __iter__(self):
return itertools.count(self.data)
obj = TestCount(1)
self.assertEqual(list(itertools.islice(obj, 5)), [1, 2, 3, 4, 5])
self.assertEqual(list(itertools.islice(obj, 25)), list(itertools.islice(obj.__iter__(), 25)))
def test_cycle(self):
class TestCycle(object):
def __init__(self, data):
self.data = data
def __iter__(self):
return itertools.cycle(self.data)
data = [1, 2, 3]
obj = TestCycle(data)
self.assertEqual(list(itertools.islice(obj, 6)), data * 2)
self.assertEqual(list(itertools.islice(obj, 6)), list(itertools.islice(obj.__iter__(), 6)))
def test_dropwhile(self):
class TestCycle(object):
def __init__(self, pred, data):
self.pred = pred
self.data = data
def __iter__(self):
return itertools.dropwhile(self.pred, self.data)
obj = TestCycle(lambda x: x<5, [1, 4, 6, 4, 1])
self.assertEqual(list(obj), [6, 4, 1])
self.assertEqual(list(obj), list(obj.__iter__()))
def test_groupby(self):
def unique_justseen(iterable, key=None):
"List unique elements, preserving order. Remember only the element just seen."
# unique_justseen('AAAABBBCCDAABBB') --> A B C D A B
# unique_justseen('ABBCcAD', str.lower) --> A B C A D
return itertools.imap(
next,
itertools.imap(operator.itemgetter(1),
itertools.groupby(iterable, key)))
class TestGroupBy(object):
def __init__(self, data, key):
self.data = data
self.key = key
def __iter__(self):
return unique_justseen(self.data, self.key)
obj = TestGroupBy('ABBCcAD', str.lower)
self.assertEqual(list(obj), list('ABCAD'))
self.assertEqual(list(obj), list(obj.__iter__()))
def test_ifilter(self):
class TestIFilter(object):
def __init__(self, pred, data):
self.pred = pred
self.data = data
def __iter__(self):
return itertools.ifilter(self.pred, self.data)
obj = TestIFilter(lambda x: x%2, range(10))
self.assertEqual(list(obj), [1, 3, 5, 7, 9])
self.assertEqual(list(obj), list(obj.__iter__()))
def test_ifilterfalse(self):
class TestIFilterFalse(object):
def __init__(self, pred, data):
self.pred = pred
self.data = data
def __iter__(self):
return itertools.ifilterfalse(self.pred, self.data)
obj = TestIFilterFalse(lambda x: x%2, range(10))
self.assertEqual(list(obj), [0, 2, 4, 6, 8])
self.assertEqual(list(obj), list(obj.__iter__()))
def test_ifilterfalse(self):
class TestIslice(object):
def __init__(self, seq, start, stop):
self.seq = seq
self.start = start
self.stop = stop
def __iter__(self):
return itertools.islice(self.seq, self.start, self.stop)
obj = TestIslice('ABCDEFG', 2, None)
self.assertEqual(list(obj), list('CDEFG'))
self.assertEqual(list(obj), list(obj.__iter__()))
def test_imap(self):
class TestImap(object):
def __init__(self, func, p, q):
self.func = func
self.p = p
self.q = q
def __iter__(self):
return itertools.imap(self.func, self.p, self.q)
obj = TestImap(pow, (2,3,10), (5,2,3))
self.assertEqual(list(obj), [32, 9, 1000])
self.assertEqual(list(obj), list(obj.__iter__()))
def test_starmap(self):
class TestStarmap(object):
def __init__(self, func, seq):
self.func = func
self.seq = seq
def __iter__(self):
return itertools.starmap(self.func, self.seq)
obj = TestStarmap(pow, [(2,5), (3,2), (10,3)])
self.assertEqual(list(obj), [32, 9, 1000])
self.assertEqual(list(obj), list(obj.__iter__()))
def test_takewhile(self):
class TestTakewhile(object):
def __init__(self, pred, seq):
self.pred = pred
self.seq = seq
def __iter__(self):
return itertools.takewhile(self.pred, self.seq)
obj = TestTakewhile(lambda x: x<5, [1, 4, 6, 4, 1])
self.assertEqual(list(obj), [1, 4])
self.assertEqual(list(obj), list(obj.__iter__()))
def test_tee(self):
def pairwise(iterable):
"s -> (s0,s1), (s1,s2), (s2, s3), ..."
a, b = itertools.tee(iterable)
next(b, None)
return itertools.izip(a, b)
class TestTee(object):
def __init__(self, func, it):
self.func = func
self.it = it
def __iter__(self):
return self.func(self.it)
obj = TestTee(pairwise, range(6))
self.assertEqual(list(obj), [(0, 1), (1, 2), (2, 3), (3, 4), (4, 5)])
self.assertEqual(list(obj), list(obj.__iter__()))
def test_izip(self):
class TestIzip(object):
def __init__(self, p, q):
self.p = p
self.q = q
def __iter__(self):
return itertools.izip(self.p, self.q)
obj = TestIzip('ABCD', 'xy')
self.assertEqual(list(obj), [('A', 'x'), ('B', 'y')])
self.assertEqual(list(obj), list(obj.__iter__()))
def test_izip_longest(self):
class TestIzipLongest(object):
def __init__(self, p, q):
self.p = p
self.q = q
def __iter__(self):
return itertools.izip_longest(self.p, self.q, fillvalue='-')
obj = TestIzipLongest('ABCD', 'xy')
self.assertEqual(list(obj), [('A', 'x'), ('B', 'y'), ('C', '-'), ('D', '-')])
self.assertEqual(list(obj), list(obj.__iter__()))
def test_combinations(self):
class TestCombinations(object):
def __init__(self, data):
self.data = data
def __iter__(self):
return itertools.combinations(self.data, 2)
obj = TestCombinations('ABCD')
self.assertEqual(list(obj), list(itertools.combinations('ABCD', 2)))
self.assertEqual(list(obj), list(obj.__iter__()))
def test_combinations_with_replacement(self):
class TestCombinationsWithReplacement(object):
def __init__(self, data):
self.data = data
def __iter__(self):
return itertools.combinations_with_replacement(self.data, 2)
obj = TestCombinationsWithReplacement('ABCD')
self.assertEqual(list(obj), list(itertools.combinations_with_replacement('ABCD', 2)))
self.assertEqual(list(obj), list(obj.__iter__()))
def test_permutations(self):
class TestPermutations(object):
def __init__(self, data):
self.data = data
def __iter__(self):
return itertools.permutations(self.data, 2)
obj = TestPermutations('ABCD')
self.assertEqual(list(obj), list(itertools.permutations('ABCD', 2)))
self.assertEqual(list(obj), list(obj.__iter__()))
def test_product(self):
class TestProduct(object):
def __init__(self, data):
self.data = data
def __iter__(self):
return itertools.product(self.data, repeat=2)
obj = TestProduct('ABCD')
self.assertEqual(list(obj), list(itertools.product('ABCD', repeat=2)))
self.assertEqual(list(obj), list(obj.__iter__()))
def test_main():
test_support.run_unittest(IterTestCase, ChainedIterationTest)
if __name__ == '__main__':
test_main()
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