python difflib comparing files
Just parse output of diff like this (change '- ' to '+ ' if needed):
#!/usr/bin/env python# difflib_testimport difflibfile1 = open('/home/saad/Code/test/new_tweets', 'r')file2 = open('/home/saad/PTITVProgs', 'r')diff = difflib.ndiff(file1.readlines(), file2.readlines())delta = ''.join(x[2:] for x in diff if x.startswith('- '))print delta
There are multiple diff styles and different functions exist for them in the difflib library. unified_diff, ndiff and context_diff.
If you don't want the line number summaries, ndiff function gives a Differ-style delta:
import difflibf1 = '''12345'''f2 = '''13456'''diff = difflib.ndiff(f1,f2)for l in diff: print(l)Output:
1- 2 3 4 5 + 6EDIT:
You could also parse the diff to extract only the changes if that's what you want:
>>>changes = [l for l in diff if l.startswith('+ ') or l.startswith('- ')]>>>for c in changes: print(c)>>>- 2+ 6