Check the existence of a string in a file from another file

Question

I have two files, one is this:

gp2,POL-AES-SHA1,Prop-AES-SHA1
gp2,POL-AES-SHA1-PFS-2,Prop-AES-SHA
POL-3DES-SHA,Prop-3DES-SHA

Note that you can have 2 or 3 items per line (separated by comma).

In the second file I have:

Prop-AES-SHA1,sha1,aes-256-cbc,8
Prop-AES-SHA,sha1,aes-128-cbc,24
POL-3DES-SHA,sha1,3des
IPSEC-AES-256-MD5,md5,aes-256-cbc
IPSEC-AES-256-CBC-SHA256,sha256,aes-256-cbc,8

Note that you can have 3 or 4 items per line, also separated by a comma.

The idea is that I take the last item of each line in the first file and look for it in the second file. If I find, I bring all the items from the row and create a row by mixing items from the two files.

It only analyzes 1 line and the code for:

file1 = open('file1')
file2 = open('file2')

for i in file1:
    i = i.strip().split(',')
    last_i = i[-1]
    for i2 in file2:
        if last_i in i2:
            print(f'{i} + {i2}')

Answer 1

From what I understand, you want to introduce everyone who gives 'match', but this second is only going through the file once. In this case, either you would store its contents in some corner, or you would have to scroll through it again every iteration of i.

This way should solve your problem.

file1 = open('file1.txt')

for i in file1:
    i = i.strip().split(',')
    last_i = i[-1]

    with open('file2.txt') as file2:
        for j in file2:
            if last_i in j:
                print(f'{i} + {j}')