用python输出列表中的最大值 python怎么输出列表最大值

如下所示：

def findMinAndMax(L):
maxL = None
minL = None
if L:
maxL = L[0]
minL = L[0]
for i in range(len(L)):
if L[i] > maxL:
maxL = L[i]
elif L[i] < minL:
minL = L[i]
else:
maxL = None
minL = None
return (minL, maxL)
测试：
# 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!')