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!')