functional programming in python examples

def sumA(n):
        if not n:#if n is empty list
                return 0
        head, *tail = n
        return head + sumA(tail)
#print(sumA([1,2,3,4,5]))

print(list(map(sumA, [[1,1,1],[2,2,2],[3,3],[4,4],[5,5]])))

print(sumA(list(map(sumA, [[1,1,1],[2,2,2],[3,3],[4,4],[5,5]]))))

from functools import reduce
import operator
def product(xs):
    return reduce(operator.mul, xs, 1)

print(product([1,2,3,4]))

def sumB(xs):
    return reduce(operator.add, xs, 1)

print(sumB([1,2,3,4]))