小编fra*_*g43的帖子

I'm trying to cut a list by specific items in it, for example, I have a list like this:

down = ["a", "b", "c", "d", "b", "e", "r"]

What I want is:

[["a", "b"]["c", "d", "b"] ["e", "r"]]

which is cut after every occurrence of "b".

I wrote something like this:

down = ["a", "b", "c", "d", "b", "e", "r"]
up = []
while down is not []:
    up, down = up.append(down[:(down.index("b") + 1)]), down[(down.index("b") + 1):]

It throws …