请教一下评论区，为啥题目要求返回一个tuple，但是不加括号也能测试成功啊？

    if len(L)==0:
        return None,None
    else:
        max=L[(0)]
        min=L[(0)]
        for x in L:
            if x>max:
                max=x
        for y in L:
            if y<min:
                min=y
        return (min,max)

    if len(L)==0:
        return None,None
    else:
        max=min=L[(0)]
        for i in L:
            if i>max:
                max=i
            if i<min:
                min=i
    return min,max