如何从列表中删除一些对？

Question

I have a list like [[2,3], [7,6], [12,567],[18,4]]. I need to remove a pair, when second element of pair is bigger than 5.

for x in table:
    if x[1] > 5:
        del x

I tried this way, but list index out of range . How to do it correctly?

Answer 1

I would do it like this:

table = [[2,3], [7,6], [12,567],[18,4]]
table = [x for x in table if not x[1] > 5]

You may want to learn more about the concept of list comprehensions. I find this article gives a good introduction:

https://www.digitalocean.com/community/tutorials/understanding-list-comprehensions-in-python-3

Answer 2

Python中有一个filter函数：

new_table = list(filter(lambda x: x[1] <= 5, table))