Zip Longest Iterator Function

This function creates an iterator that aggregates elements from multiple iterable objects. It stops when the shortest iterable is exhausted and fills missing values with fillvalue.

Technology Stack : Built-in function

Code Type : Function

Code Difficulty : Intermediate

                
                    
def zip_longest(*iterables, fillvalue=None):
    "Make an iterator that aggregates elements from each of the iterables."
    "It stops when the shortest iterable is exhausted, filling missing values with fillvalue."
    iterators = [iter(it) for it in iterables]
    while True:
        result = []
        for it in iterators:
            try:
                result.append(next(it))
            except StopIteration:
                result.append(fillvalue)
        if len(result) == 1:
            return result[0]
        yield result