Randomly had the urge to write a Fibonacci sequence backed by a python generator.

fibonacci.py

def fib():
  x = 0
  y = 1

  while True:
    yield x
    x, y = y, x + y


def take(n, coll):
  return [x[1] for x in zip(range(n), coll)]


if __name__ == '__main__':

  # Make sure that take() works.
  assert take(3, [0, 1, 2, 3, 4, 5]) == [0, 1, 2]

  outcome = [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55]

  # Ensure our fib sequence works!
  assert take(len(outcome), f) == outcome