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imaima

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def findMinAndMax(L):

    if L==[]:

        x=y=None

    else:

        for x in L:

            x=min(L)

        for y in L:

            y=max(L)

    return(x,y)

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!')


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