用列表推导式如何生成如下列表:[[1, 2, 3], [4, 5, 6], [7, 8, 9]]
inner_list = []
outer_list = []
for i in range(1,10):
inner_list.append(i)
if i % 3 == 0:
outer_list.append(inner_list)
inner_list = []
print(outer_list)
运行
[[1, 2, 3], [4, 5, 6], [7, 8, 9]]