Combining Iterables with FillValue Using zip_longest

The function combines multiple iterable objects into an iterator. If one of the iterable objects is exhausted, a specified fill value is used to fill the other iterable objects.

Technology Stack : itertools, collections

Code Type : Iterator

Code Difficulty : Intermediate

                
                    
def zip_longest(*args, fillvalue=0):
    from itertools import zip_longest
    from collections import deque

    def fill_deques(deques, fill_value):
        for deque_ in deques:
            while len(deque_) < len(args):
                deque_.append(fill_value)

    iters = [iter(arg) for arg in args]
    fill_deques(iters, fillvalue)
    while True:
        try:
            yield tuple(arg.next() for arg in iters)
        except StopIteration:
            break