Combining Iterables with FillValue

The function is used to combine multiple iterable objects into an iterator. If one of the iterable objects is shorter, it is padded with fillvalue.

Technology Stack : itertools

Code Type : Function

Code Difficulty : Intermediate

                
                    
def zip_longest(*iterables, fillvalue=None):
    "Make an iterator that aggregates elements from each of the iterables.
    The shortest iterable is padded with fillvalue.
    See: https://docs.python.org/3/library/itertools.html#itertools.zip_longest"
    iterators = [iter(it) for it in iterables]
    while True:
        result = []
        for it in iterators:
            try:
                result.append(next(it))
            except StopIteration:
                result.append(fillvalue)
        yield result