Zip Longest with Fillvalue

This function is used to concatenate multiple iterable objects. If one iterator is exhausted, it is filled with fillvalue.

Technology Stack : Built-in library

Code Type : Iterator

Code Difficulty : Intermediate

                
                    
def zip_longest(*args, fillvalue=0):
    iters = [iter(arg) for arg in args]
    while True:
        result = []
        for i, it in enumerate(iters):
            try:
                result.append(next(it))
            except StopIteration:
                iters[i] = iter([fillvalue])
                result.append(fillvalue)
        yield tuple(result)