Zip Longest Iterator with Fillvalue

This function returns an iterator that yields elements taken from the provided iterable objects. If an iterable is exhausted, it is filled with fillvalue.

Technology Stack : collections

Code Type : Function

Code Difficulty : Intermediate

                
                    
def zip_longest(*args, fillvalue=0):
    # 从内置库中选取：collections
    from collections import deque

    iterators = [deque(iter(a)) for a in args]
    longest = max(iterators, key=len)
    for i in longest:
        for it in iterators:
            yield next(it, fillvalue)

# JSON输出