a=list(range(10))
b=list(range(3,20,-1))
c=list(range(20,3,-1))
d=[x for x in range(10)]
print(a)
print(b)
print(c)
print(d)
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
[]
[20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4]
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
为哈这个b打印出来后是空列表啊?