largest_series_product.py 文件源码

def largest_product(txt, n):
    if len(txt) < n or n < 0:
        raise ValueError("Input length is less than n")

    if any(not c.isdigit() for c in txt):
        raise ValueError("Input must be numeric")

    if n == 0:
        return 1

    products = [reduce(mul, grp) for grp in slices(txt, n)]
    largest = reduce(max, products)

    return largest


# from series.py