If I have file containing lines like these: >17:18:44.134482

>>210209
Sorry, this in in Python.

>>210212
If the thing you're searching for in each string is in the same index every time, you could just split the input by spaces, loop through each line and append [IP#1, IP#2] to a list. Otherwise you can probably use a regex to parse specifically for IPs.

>>210226
I looped the lines with split to make something like

[['a1', 'a2', 'a3'], ['b1', 'b2', 'b3'], ['c1', 'c2', 'c3']]

which places the items I need to be always at index[0], [2], and [-1] but I'm having trouble appending just those indexes to the list while maintaining the list.

I ended up making them one big list like so:

['a1' ,'a2', 'a3', 'b1', 'b2', 'b3', 'c1', 'c2', 'c3']

I'm not exactly sure how to append multiple indexes so that they'd be their own item as below:

[['a1' ,'a2', 'a3'], ['b1', 'b2', 'b3'], ['c1', 'c2', 'c3']]

>>210249
You can make a list of [a1, a2, a3, whatever] each loop and append that list to another list outside the loop.

>>210209
Good lord, man, use AWK.

>>210209
No idea how it would be in python but I made this using javascript, hopefully is what you need
https://plnkr.co/edit/bLQGuCkRrmmdHE5agHxj

>>210312
I used regular expression btw.

>>210212
>Sorry, this in in Python.
Go read up on generators.

You write a generator that picks out the bits from the lines that you're interested in and yields tuples, i.e.

ingests
>17:18:44.134482 IP 192.168.0.15.37743 > 66.235.141.146.80: Flags [P.], seq 1449:2897, ack 1, win 29200, options [nop,nop,TS val 43002850 ecr 3883480196], length 5
and yields
>(192.168.0.15:37743, 66.235.141.146:80, 5)

then you can zip(*) the file into three lists, with the generator in the middle sorting things out.

src,dest,len = zip(*gen_tcpdump('tcpdump.log'))

Here's a good introduction to generators: https://www.oreilly.com/ideas/2-great-benefits-of-python-generators-and-how-they-changed-me-forever

>>210226
>>210282
Thanks for the help. I combined yours with >>210303 to get a list with each sub-list containing with just the indexes I needed.

How would I go about checking if a pair of IPs is already within the list and instead of appending, increment the length.
So with a list of: [['a1','a2', 5], ['b1','b2',5]]
and gets a another list with: ['a1','a2',5]
it'd become: [['a1','a2', 10], ['b1','b2',5]]

>>210312
>>210314
Thanks for helping, it's similar to what I needed (just missing a 3 column for lengths) but in Python.

>>210316
Didn't see the length part, check the code again, just added support to add the lengths too.
https://plnkr.co/edit/bLQGuCkRrmmdHE5agHxj

>>210316
>How would I go about checking if a pair of IPs is already within the list
Concatenate the two IPs into a single string, then use that as the key in a defaultdict.

lengths=defaultdict(int)
for (src, dest, len) in biglonglist:
____lengths[src+dest] += len

>>210321
Actually, I'm being a derp: you can index dictionaries by tuples.


lengths=defaultdict(int)
for (src, dest, len) in biglonglist:
____lengths[(src,dest)] += len