def test_fib_infinite_stream(self):
from operator import add
f = Stream()
fib = f << [0, 1] << iters.map(add, f, iters.drop(1, f))
self.assertEqual([0,1,1,2,3,5,8,13,21,34], list(iters.take(10, fib)))
self.assertEqual(6765, fib[20])
self.assertEqual([832040,1346269,2178309,3524578,5702887], fib[30:35])
def test_fib_infinite_stream(self):
from operator import add
f = Stream()
fib = f << [0, 1] << iters.map(add, f, iters.drop(1, f))
self.assertEqual([0,1,1,2,3,5,8,13,21,34], list(iters.take(10, fib)))
self.assertEqual(6765, fib[20])
self.assertEqual([832040,1346269,2178309,3524578,5702887], list(fib[30:35]))
# 35 elements should be already evaluated
self.assertEqual(fib.cursor(), 35)
def test_fib_infinite_stream(self):
from operator import add
f = Stream()
fib = f << [0, 1] << iters.map(add, f, iters.drop(1, f))
self.assertEqual([0,1,1,2,3,5,8,13,21,34], list(iters.take(10, fib)))
self.assertEqual(6765, fib[20])
self.assertEqual([832040,1346269,2178309,3524578,5702887], list(fib[30:35]))
# 35 elements should be already evaluated
self.assertEqual(fib.cursor(), 35)
def test_take(self):
self.assertEqual([0, 1], list(iters.take(2, range(10))))
self.assertEqual([0, 1], list(iters.take(10, range(2))))
def test_unfold_infinite(self):
doubler = op.unfold(lambda x: (x*2, x*2))
self.assertEqual(20, next(doubler(10)))
self.assertEqual([20, 40, 80, 160, 320], list(iters.take(5, doubler(10))))
def test_take(self):
self.assertEqual([0,1], list(iters.take(2, range(10))))
self.assertEqual([0,1], list(iters.take(10, range(2))))
def test_unfold_infinite(self):
doubler = op.unfold(lambda x: (x * 2, x * 2))
self.assertEqual(20, next(doubler(10)))
self.assertEqual([20, 40, 80, 160, 320],
list(iters.take(5, doubler(10))))