chunker generator

# This could be improved.

def chunker(iterable, num):
    """
    Returns an generator which yields the available chunks.
    If the last chunk is incomplete, it'll be cut off.
    """
    iterator = iter(iterable)
    while iterator:
        ret = []
        for _ in range(num):
            try:
                ret.append(next(iterator))
            except StopIteration:
                return
        else:
            yield ret


# hint from #python: use itertools
# credits to: KirkMcDonald

num = 2
iterable = [1,2,3,4]
list(itertools.zip(*[iter(iterable)] * 2)) # no elements will lost
list(zip(*[iter(iterable)] * num)) # last incomplete chunks will be lost

#as function

def chunker_builtin(zip_function, length, iterable):
    return zip_function(*[iter(iterable)] * length)

# chunker_builtin(itertools.zip_longest, 2, iterable) -> returns an generator