python - 使用迭代查找一个list中的最大最小值，并返回一个tuple

def findMaxAndMin(L):
    if L == []:
        return (None,None)
    else:
        my_min = L[0]
        my_max = L[0]
        for i in L:
            if my_min > i:
                my_min = i
            if my_max < i:
                my_max = i
        return (my_max,my_min)
 
import random
l = list(range(0,10))
random.shuffle(l)
print(l)
        ##[5, 2, 4, 7, 8, 3, 0, 1, 9, 6]
print(findMaxAndMin(l))
    ##(9, 0)
    
l = []
print(findMaxAndMin(l))
        ##(None, None)