Iterator to return a sequence of blocks from an iterable

blocks.py

def blocks(iterable, n):
    """Create a generator that returns blocks of values

    This generator yields lists of values from the iterable that contain 'n'
    elements (except, possible, for the last block if the length of the iterable
    is not divisible by 'n').

    Arguments:
        iterable: an interable object like a list or generator
        n: a positive integer

    """
    iterator = iter(iterable)
    while True:
        try:
            block = []
            for _ in range(n):
                block.append(iterator.next())

        finally:
            yield block