[Python]用迭代查找一个list中最小和最大值

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Python高级特性：迭代

请使用迭代查找一个list中最小和最大值，并返回一个tuple：

# -*- coding: utf-8 -*-

def findMinAndMax(L):
    if(L==[]):
        return (None,None)
    else:
        max=L[0]
        min=L[0]
        for x in L:
            if(x>max):
                max=x
            if(x<min):
                min=x
        return(min,max)
        
        
# 测试
if findMinAndMax([]) != (None, None):
    print('测试失败!')
elif findMinAndMax([7]) != (7, 7):
    print('测试失败!')
elif findMinAndMax([7, 1]) != (1, 7):
    print('测试失败!')
elif findMinAndMax([7, 1, 3, 9, 5]) != (1, 9):
    print('测试失败!')
else:
    print('测试成功!')

>>> runfile('D:/Programing/Python/person.py', wdir='D:/Programing/Python')
测试成功!