python - 使用迭代查找最大值和最小值时的Python TypeError

Question

错误消息是:

Traceback (most recent call last):

File "C:/1-Python/2-projects/最值.py", line 18, in elif findMinAndMax([7]) != (7, 7):

File "C:/1-Python/2-projects/最值.py", line 7, in findMinAndMax for i, in L:

TypeError: cannot unpack non-iterable int object

我的代码

def findMinAndMax(L):
    if L == []:
        return (None, None)
    else:
        max1 = L[0]
        min1 = L[0]
        for i, in L:
            if i >= max1:
                max1 = i
            elif i <= min1:
                min1 = i

        return (min1, max1)


if findMinAndMax([]) != (None, None):
    print('test failed!')
elif findMinAndMax([7]) != (7, 7):
    print('test failed!!')
elif findMinAndMax([7, 1]) != (1, 7):
    print('test failed!!')
elif findMinAndMax([7, 1, 3, 9, 5]) != (1, 9):
    print('test failed!!')
else:
    print('test success!!')

Answer 1

只需在for循环中删除逗号:

...
for i in L:
    ...