def test_compose_mapping_and_filter(self):
composed = compose(crt.filtering(lambda x: x < 5),
crt.mapping(lambda x: x * 2))
result = []
f = composed(crt.append(result))
for i in range(10):
f.send(i)
self.assertListEqual(result, [x * 2 for x in range(10) if x < 5])
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))
def test_compose_mapping_and_filter(self):
composed = compose(
crt.filtering(lambda x: x < 5),
crt.mapping(lambda x: x * 2))
result = []
f = composed(crt.append(result))
for i in range(10):
f.send(i)
self.assertListEqual(
result,
[x * 2 for x in range(10) if x < 5])
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))
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))))))
def test_compose_three_coroutines(self):
composed = compose(crt.mapping(lambda x: x * 2),
crt.mapping(lambda x: x * x),
crt.filtering(lambda x: x % 2 == 0))
result = []
f = composed(crt.append(result))
for i in range(100):
f.send(i)
self.assertListEqual(
result,
list(
filter(lambda z: z % 2 == 0,
(x * x for x in (y * 2 for y in range(100))))))
def test_reuse_single_taking_instance(self):
take_5 = crt.taking(5)
composed = compose(take_5, crt.mapping(lambda x: x * 2), take_5)
result = []
f = composed(crt.append(result))
try:
for i in range(1000):
f.send(i)
except crt.StopConsumption:
pass
expected = list(
itertools.islice((x * 2 for x in itertools.islice(range(1000), 5)),
5))
self.assertListEqual(result, expected)
def test_compose_three_coroutines(self):
composed = compose(
crt.mapping(lambda x: x * 2),
crt.mapping(lambda x: x * x),
crt.filtering(lambda x: x % 2 == 0))
result = []
f = composed(crt.append(result))
for i in range(100):
f.send(i)
self.assertListEqual(
result,
list(filter(
lambda z: z % 2 == 0,
(x * x for x in
(y * 2 for y in
range(100))))))
def test_reuse_single_taking_instance(self):
take_5 = crt.taking(5)
composed = compose(
take_5,
crt.mapping(lambda x: x * 2),
take_5)
result = []
f = composed(crt.append(result))
try:
for i in range(1000):
f.send(i)
except crt.StopConsumption:
pass
expected = list(itertools.islice(
(x * 2 for x in itertools.islice(range(1000), 5)), 5))
self.assertListEqual(
result,
expected)
