python 代碼題02 使用迭代查找一個list中最小和最大值，並返回一個tuple

def findMinAndMax(L):
	if L!=[]:
		min = L[0]
		max = L[0]
		for i in L:
			if max < i:
				max = i
			if min > i :
				min = i
		return(min, max)
	else: return (None, None)
	
# 測試
if findMinAndMax([]) != (None, None):
    print('測試失敗!')
elif findMinAndMax([7]) != (7, 7):
    print('測試失敗!')
elif findMinAndMax([7, 1]) != (1, 7):
    print('測試失敗!')
elif findMinAndMax([7, 1, 3, 9, 5]) != (1, 9):
    print('測試失敗!')
else:
    print('測試成功!')