def test_filterFromGeneratorReinstantiatesProperly(self):
s = stream(ItrFromFunc(lambda: (i for i in xrange(5))))
s = s.filter(lambda e: e % 2 == 0)
self.assertEquals(s.toList(), [0, 2, 4])
self.assertEquals(s.toList(), [0, 2, 4])
s = stream(xrange(5)).filter(lambda e: e % 2 == 0)
self.assertEquals(s.toList(), [0, 2, 4])
self.assertEquals(s.toList(), [0, 2, 4])
def test_filterFromGeneratorReinstantiatesProperly(self):
s = stream(ItrFromFunc(lambda: (i for i in xrange(5))))
s = s.filter(lambda e: e % 2 == 0)
self.assertEquals(s.toList(), [0, 2, 4])
self.assertEquals(s.toList(), [0, 2, 4])
s = stream(xrange(5)).filter(lambda e: e % 2 == 0)
self.assertEquals(s.toList(), [0, 2, 4])
self.assertEquals(s.toList(), [0, 2, 4])
def testStream(self):
s = self.s
self.assertEquals(list(ifilter(lambda i: i % 2 == 0, s())), [2])
self.assertEquals(list(s().filter(lambda i: i % 2 == 0)), [2])
self.assertEquals(s().filter(lambda i: i % 2 == 0).toList(), [2])
self.assertEquals(s()[1], 2)
self.assertEquals(s()[1:].toList(), [2, 3])
self.assertEqual(s().take(2).toList(), [1, 2])
self.assertAlmostEqual(stream((0, 1, 2, 3)).filter(lambda x: x > 0).entropy(), 1.4591479)
self.assertEquals(stream([(1, 2), (3, 4)]).zip().toList(), [(1, 3), (2, 4)])
def test_stream_add(self):
s1 = stream([1, 2])
s2 = stream([3, 4])
s3 = s1 + s2
ll = s3.toList()
self.assertEquals(s3.toList(), [1, 2, 3, 4])
self.assertEquals(s3.toList(), [1, 2, 3, 4]) # second time to exclude one time iterator bug
s1 = s1 + s2
self.assertEquals(s1.toList(), [1, 2, 3, 4])
self.assertEquals(s1.toList(), [1, 2, 3, 4]) # second time to exclude one time iterator bug
def testStream(self):
s = self.s
self.assertEquals(list(ifilter(lambda i: i % 2 == 0, s())), [2])
self.assertEquals(list(s().filter(lambda i: i % 2 == 0)), [2])
self.assertEquals(s().filter(lambda i: i % 2 == 0).toList(), [2])
self.assertEquals(s()[1], 2)
self.assertEquals(s()[1:].toList(), [2, 3])
self.assertEqual(s().take(2).toList(), [1, 2])
self.assertAlmostEqual(
stream((0, 1, 2, 3)).filter(lambda x: x > 0).entropy(), 1.4591479)
self.assertEquals(
stream([(1, 2), (3, 4)]).zip().toList(), [(1, 3), (2, 4)])
def test_stream_add(self):
s1 = stream([1, 2])
s2 = stream([3, 4])
s3 = s1 + s2
ll = s3.toList()
self.assertEquals(s3.toList(), [1, 2, 3, 4])
self.assertEquals(
s3.toList(),
[1, 2, 3, 4]) # second time to exclude one time iterator bug
s1 = s1 + s2
self.assertEquals(s1.toList(), [1, 2, 3, 4])
self.assertEquals(
s1.toList(),
[1, 2, 3, 4]) # second time to exclude one time iterator bug
def test_flatMap_reiteration(self):
l = stream(
ItrFromFunc(lambda: (xrange(i) for i in xrange(5)))).flatMap()
self.assertEquals(l.toList(), [0, 0, 1, 0, 1, 2, 0, 1, 2, 3])
self.assertEquals(
l.toList(),
[0, 0, 1, 0, 1, 2, 0, 1, 2, 3
]) # second time to assert the regeneration of generator
def test_stream_iadd(self):
s1 = stream([1, 2])
s1 += [3, 4]
self.assertEquals(s1.toList(), [1, 2, 3, 4])
self.assertEquals(
s1.toList(),
[1, 2, 3, 4]) # second time to exclude one time iterator bug
self.assertEquals(s1.toList(), [1, 2, 3, 4])
def test_flatMap_basics(self):
l = stream(({1: 2, 3: 4}, {5: 6, 7: 8}))
self.assertEquals(
l.flatMap(dict.itervalues).toSet(), set((2, 4, 6, 8)))
self.assertEquals(l.flatMap(dict.iterkeys).toSet(), set((1, 3, 5, 7)))
self.assertEquals(
l.flatMap(dict.iteritems).toSet(),
set(((1, 2), (5, 6), (3, 4), (7, 8))))
def testStreamsFromGenerator(self):
sg = stream(ItrFromFunc(lambda: (i for i in range(4))))
self.assertEqual(sg.size(), 4)
self.assertEqual(sg.size(), 4)
self.assertEqual(sg.filter(lambda x: x > 1).toList(), [2, 3])
self.assertEqual(sg.filter(lambda x: x > 1).toList(), [2, 3])
self.assertEqual(sg.map(lambda x: x > 1).toList(), [False, False, True, True])
self.assertEqual(sg.map(lambda x: x > 1).toList(), [False, False, True, True])
self.assertEqual(sg.head(), 0)
self.assertEqual(sg.head(), 0)
self.assertEqual(sg.map(lambda i: i ** 2).enumerate().toList(), [(0, 0), (1, 1), (2, 4), (3, 9)])
self.assertEqual(sg.reduce(lambda x, y: x + y, 5), 11)
def testStreamsFromGenerator(self):
sg = stream(ItrFromFunc(lambda: (i for i in range(4))))
self.assertEqual(sg.size(), 4)
self.assertEqual(sg.size(), 4)
self.assertEqual(sg.filter(lambda x: x > 1).toList(), [2, 3])
self.assertEqual(sg.filter(lambda x: x > 1).toList(), [2, 3])
self.assertEqual(
sg.map(lambda x: x > 1).toList(), [False, False, True, True])
self.assertEqual(
sg.map(lambda x: x > 1).toList(), [False, False, True, True])
self.assertEqual(sg.head(), 0)
self.assertEqual(sg.head(), 0)
self.assertEqual(
sg.map(lambda i: i**2).enumerate().toList(), [(0, 0), (1, 1),
(2, 4), (3, 9)])
self.assertEqual(sg.reduce(lambda x, y: x + y, 5), 11)
def testStreamToJson(self):
from Json import Json
j = stream((("a", 2), (3, 4))).toJson()
self.assertIsInstance(j, Json)
self.assertEqual(j.a, 2)
def test_flatMap_basics(self):
l = stream(({1: 2, 3: 4}, {5: 6, 7: 8}))
self.assertEquals(l.flatMap(dict.itervalues).toSet(), set((2, 4, 6, 8)))
self.assertEquals(l.flatMap(dict.iterkeys).toSet(), set((1, 3, 5, 7)))
self.assertEquals(l.flatMap(dict.iteritems).toSet(), set(((1, 2), (5, 6), (3, 4), (7, 8))))
def test_streamExists(self):
s = stream(xrange(2))
self.assertEqual(s.exists(lambda e: e == 0), True)
self.assertEqual(s.exists(lambda e: e == 2), False)
def testGroupBy(self):
s = stream(iter((1, 2, 3, 4)))
l = s.groupBy(lambda k: k % 2).sorted(key=itemgetter(0)).toList()
self.assertEquals([(0, [2, 4]), (1, [1, 3])], l)
def test_stream_iadd(self):
s1 = stream([1, 2])
s1 += [3, 4]
self.assertEquals(s1.toList(), [1, 2, 3, 4])
self.assertEquals(s1.toList(), [1, 2, 3, 4]) # second time to exclude one time iterator bug
self.assertEquals(s1.toList(), [1, 2, 3, 4])
def test_mins(self):
self.assertEquals(stream(['abc', 'a', 'abcd', 'defg', 'cde']).mins(lambda s: len(s)), ['a'])
def setUp(self):
self.s = lambda: stream((1, 2, 3))
def setUp(self):
self.s = lambda: stream((1, 2, 3))
def test_streamExists(self):
s = stream(xrange(2))
self.assertEqual(s.exists(lambda e: e == 0), True)
self.assertEqual(s.exists(lambda e: e == 2), False)
def test_mins(self):
self.assertEquals(
stream(['abc', 'a', 'abcd', 'defg', 'cde']).mins(lambda s: len(s)),
['a'])
def testGroupBy(self):
s = stream(iter((1, 2, 3, 4)))
l = s.groupBy(lambda k: k % 2).sorted(key=itemgetter(0)).toList()
self.assertEquals([(0, [2, 4]), (1, [1, 3])], l)
def test_flatMap_reiteration(self):
l = stream(ItrFromFunc(lambda: (xrange(i) for i in xrange(5)))).flatMap()
self.assertEquals(l.toList(), [0, 0, 1, 0, 1, 2, 0, 1, 2, 3])
self.assertEquals(l.toList(),
[0, 0, 1, 0, 1, 2, 0, 1, 2, 3]) # second time to assert the regeneration of generator
def testStreamToJson(self):
from Json import Json
j = stream((("a", 2), (3, 4))).toJson()
self.assertIsInstance(j, Json)
self.assertEqual(j.a, 2)