Difference Between 2 files

[enigma619]

Hi

I've a question to compare 2 files.

My first file 'file_new' contain:

Output:
1
2
3
5
6
7

My second file 'file_old' contains:

Output:
1
2
3
4
5
6

I want to compare these two files.
My file_new contain "reality" now.

So my script is

#!/usr/bin/env python3
import difflib

file_old = "/tmp/file_old"
file_new = "/tmp/file_new"

diff = difflib.ndiff(open(file_old).readlines(),open(file_new).readlines())
print (''.join(diff))

Result is:

Output:
  1
  2
  3
- 4
  5
  6
+ 7

Is there any mean to retrieve simply - and + values?
- To put them on a new file?
- To put them in an array / temporary json?

I'm doing some tests and reading docs but for the moment not concluant.

Thanks for ideas and help

Alex