コード例 #1
0
    def test_compose_three_transducers(self):
        tdx = compose(
            tdc.mapping(lambda x: x * 2),
            tdc.mapping(lambda x: x * x),
            tdc.filtering(lambda x: x % 2 == 0))

        x = tdc.reduce(tdx(operator.add),
                   range(100), 0)

        self.assertEqual(
            x,
            sum(filter(lambda x: x % 2 == 0,
                       (x * x
                        for x in (y * 2
                                  for y in range(100))))))
コード例 #2
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 def test_reuse_single_taking_instance(self):
     take_5 = tdc.taking(5)
     tdx = compose(
         take_5,
         tdc.mapping(lambda x: x * 2),
         take_5)
     x = tdc.reduce(tdx(append), range(100), [])
     y = itertools.islice(
         (x * 2 for x in itertools.islice(range(100), 5)), 5)
     self.assertEqual(x, list(y))
コード例 #3
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    def test_compose_mapping_and_filter(self):
        tdx = compose(
            tdc.filtering(lambda x: x < 5),
            tdc.mapping(lambda x: x * 2))

        x = tdc.reduce(tdx(operator.mul),
                   range(1, 10), 1)

        self.assertEqual(
            x,
            tdc.reduce(operator.mul,
                   (i * 2 for i in range(1, 10) if i < 5),
                   1))
コード例 #4
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 def test_mapping(self):
     tdx = tdc.mapping(lambda x: x * 2)
     x = tdc.reduce(tdx(operator.add), range(10), 0)
     self.assertEqual(x, sum(x * 2 for x in range(10)))