def chunks(iterator, size):
for item in iterator:<EOL><INDENT>yield [item] + list(islice(iterator, size - <NUM_LIT:1>))<EOL><DEDENT>
Split an iterator into chunks with `size` elements each.
    Warning:
        ``size`` must be an actual iterator, if you pass this a
        concrete sequence will get you repeating elements.
        So ``chunks(iter(range(1000)), 10)`` is fine, but
        ``chunks(range(1000), 10)`` is not.
    Example:
        # size == 2
        >>> x = chunks(iter([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]), 2)
        >>> list(x)
        [[0, 1], [2, 3], [4, 5], [6, 7], [8, 9], [10]]
        # size == 3
        >>> x = chunks(iter([0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]), 3)
        >>> list(x)
        [[0, 1, 2], [3, 4, 5], [6, 7, 8], [9, 10]]