[Python] 평균 구하기

[나의 풀이]

def solution(arr):
    return sum(arr)/len(arr)

[다른 풀이]

def average(list):
    return (sum(list) / len(list))

def average(list):
    if len(list) == 0:
        return 0
    return sum(list) / len(list)

from functools import reduce
def average(list):
    return reduce(lambda x, y : x + y, list) / len(list)