1.想由一个列表[1,2,3,4,5]输出成类似1-2-3-4-5这样由分隔符连接起来的序列
l = [1,2,3,4,5]print(*l, sep='-')
l = [1,2,3,4,5]
print(*l, sep='-')
2.获取列表的第一个，最后一个和中间的元素
l = [1,2,3,4,5]head, *body, tail = lprint(head, body, tail)
head, *body, tail = l
print(head, body, tail)
