花点时间把python入门＜十五＞——迭代实现最大值与最小值

# -*- coding: utf-8 -*-
def findMinAndMax(L):
    min,max=L[0],L[0]
    for x in L:
        if max<x:
            max=x
        if min>x:
            min=x
    n=print('min:',min,'max:',max)
    return None
L=[1,3,4,67,4,3,2]
print(findMinAndMax(L))