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I am trying to use difflib to produce diff for two text files containing tweets. Here is the code:
#!/usr/bin/env python # difflib_test import difflib file1 = open('/home/saad/Code/test/new_tweets', 'r') file2 = open('/home/saad/PTITVProgs', 'r') diff = difflib.context_diff(file1.readlines(), file2.readlines()) delta = ''.join(diff) print delta Here is the PTITVProgs text file:
Watch PTI on April 6th (7) Dr Israr Shah at 10PM on Business Plus in "Talking Policy". Rgds #PTI CORRECTION!! Watch PTI on April 6th (5) @Asad_Umar at 8PM on ARY News. Rgds #PTI Watch PTI on April 6th (5) @Asad_Umar at 8PM on AAJ News (6) PTI vs PMLN at 8PM on NewsOne. Rgds #PTI Watch PTI on April 6th (5) Asad Umar at 8PM on AAJ News (6) PTI vs PMLN at 8PM on NewsOne. Rgds #PTI Watch PTI on April 6th (5) Waleed Iqbal at 8PM on Channel 5. Rgds #PTI Watch PTI on April 6th (3) Dr Israr Shah at 10PM on PTV News. Rgds #PTI Watch PTI on April 6th (4) Javed hashmi at 1PM on PTV News. Rgds #PTI Watch PTI on April 6th (3) Imran Alvi at 1PM on AAJ News. Rgds #PTI Watch PTI on April 6th (1) Dr @ArifAlvi, Andleeb Abbas and Ehtisham Ameer at 11PM on ARY News (2) Hamid Khan at 10PM on ATV. Rgds #PTI Watch PTI on April 5th (1) Farooq Amjad Meer at 10:45PM on Dunya News. Rgds #PTI Watch PTI on April 4th (4) Faisal Khan at 8PM on PTV News. Rgds #PTI @FaisalJavedKhan Watch PTI on April 4th (3) Faisal Khan at 11PM on ATV. Rgds #PTI @FaisalJavedKhan Watch PTI on April 4th (1) Dr Israr Shah at 8PM on Waqt News (2) Dr Arif Alvi at 9PM on PTV World. Rgds #PTI @ArifAlvi Watch PTI on April 3rd (12) Abrar ul Haq on 10PM on Dawn News (13) Shabbir Sial at 10PM on Channel5. Rgds #PTI Watch PTI on April 3rd (11) Sadaqat Abbasi on 8PM on RohiTV. Rgds #PTI Watch PTI on April 3rd (10) Dr Zarqa and Andleeb Abbas on 8PM on Waqt News. Rgds #PTI Watch PTI on April 3rd (9) Fauzia Kasuri at 8PM on Din News. Rgds #PTI Watch PTI on April 3rd (8) Mehmood Rasheed at 8PM on ARY News. Rgds #PTI Watch PTI on April 3rd (7) Israr Abbasi (Repeat on Arp 4th) at 1:20AM and 1PM on Vibe TV. Rgds #PTI Watch PTI on April 3rd (5) Rao Fahad at 9PM on Express News (6) Dr Seems Zia at 10:30PM on Health TV. Rgds #PTI Here is the new_tweets text file:
Watch PTI on April 7th (3) Malaika Reza at 8PM on AAJ News (4) Shah Mehmood Qureshi at 8PM on Geo News. Rgds #PTI Watch PTI on April 7th (2) Chairman IMRAN KHAN at 10PM on PTV News in News Night with Sadia Afzal, Rpt: 2AM, 2PM. Rgds #PTI @ImranKhanPTI Watch PTI on April 7th (1) Dr Waseem Shahzad NOW at 6PM on PTV News. Rgds #PTI Watch PTI on April 6th (7) Dr Israr Shah at 10PM on Business Plus in "Talking Policy". Rgds #PTI CORRECTION!! Watch PTI on April 6th (5) @Asad_Umar at 8PM on ARY News. Rgds #PTI Watch PTI on April 6th (5) @Asad_Umar at 8PM on AAJ News (6) PTI vs PMLN at 8PM on NewsOne. Rgds #PTI Watch PTI on April 6th (5) Asad Umar at 8PM on AAJ News (6) PTI vs PMLN at 8PM on NewsOne. Rgds #PTI Watch PTI on April 6th (5) Waleed Iqbal at 8PM on Channel 5. Rgds #PTI Watch PTI on April 6th (3) Dr Israr Shah at 10PM on PTV News. Rgds #PTI Watch PTI on April 6th (4) Javed hashmi at 1PM on PTV News. Rgds #PTI Watch PTI on April 6th (3) Imran Alvi at 1PM on AAJ News. Rgds #PTI Watch PTI on April 6th (1) Dr @ArifAlvi, Andleeb Abbas and Ehtisham Ameer at 11PM on ARY News (2) Hamid Khan at 10PM on ATV. Rgds #PTI Watch PTI on April 5th (1) Farooq Amjad Meer at 10:45PM on Dunya News. Rgds #PTI Watch PTI on April 4th (4) Faisal Khan at 8PM on PTV News. Rgds #PTI @FaisalJavedKhan Watch PTI on April 4th (3) Faisal Khan at 11PM on ATV. Rgds #PTI @FaisalJavedKhan Watch PTI on April 4th (1) Dr Israr Shah at 8PM on Waqt News (2) Dr Arif Alvi at 9PM on PTV World. Rgds #PTI @ArifAlvi Watch PTI on April 3rd (12) Abrar ul Haq on 10PM on Dawn News (13) Shabbir Sial at 10PM on Channel5. Rgds #PTI Watch PTI on April 3rd (11) Sadaqat Abbasi on 8PM on RohiTV. Rgds #PTI Watch PTI on April 3rd (10) Dr Zarqa and Andleeb Abbas on 8PM on Waqt News. Rgds #PTI Watch PTI on April 3rd (9) Fauzia Kasuri at 8PM on Din News. Rgds #PTI Here is the diff i get from the program:
*** --- *************** *** 1,7 **** - Watch PTI on April 7th (3) Malaika Reza at 8PM on AAJ News (4) Shah Mehmood Qureshi at 8PM on Geo News. Rgds #PTI - Watch PTI on April 7th (2) Chairman IMRAN KHAN at 10PM on PTV News in News Night with Sadia Afzal, Rpt: 2AM, 2PM. Rgds #PTI - @ImranKhanPTI - Watch PTI on April 7th (1) Dr Waseem Shahzad NOW at 6PM on PTV News. Rgds #PTI Watch PTI on April 6th (7) Dr Israr Shah at 10PM on Business Plus in "Talking Policy". Rgds #PTI CORRECTION!! Watch PTI on April 6th (5) @Asad_Umar at 8PM on ARY News. Rgds #PTI Watch PTI on April 6th (5) @Asad_Umar at 8PM on AAJ News (6) PTI vs PMLN at 8PM on NewsOne. Rgds #PTI --- 1,3 ---- *************** *** 21,24 **** Watch PTI on April 3rd (12) Abrar ul Haq on 10PM on Dawn News (13) Shabbir Sial at 10PM on Channel5. Rgds #PTI Watch PTI on April 3rd (11) Sadaqat Abbasi on 8PM on RohiTV. Rgds #PTI Watch PTI on April 3rd (10) Dr Zarqa and Andleeb Abbas on 8PM on Waqt News. Rgds #PTI ! Watch PTI on April 3rd (9) Fauzia Kasuri at 8PM on Din News. Rgds #PTI--- 17,23 ---- Watch PTI on April 3rd (12) Abrar ul Haq on 10PM on Dawn News (13) Shabbir Sial at 10PM on Channel5. Rgds #PTI Watch PTI on April 3rd (11) Sadaqat Abbasi on 8PM on RohiTV. Rgds #PTI Watch PTI on April 3rd (10) Dr Zarqa and Andleeb Abbas on 8PM on Waqt News. Rgds #PTI ! Watch PTI on April 3rd (9) Fauzia Kasuri at 8PM on Din News. Rgds #PTI ! Watch PTI on April 3rd (8) Mehmood Rasheed at 8PM on ARY News. Rgds #PTI ! Watch PTI on April 3rd (7) Israr Abbasi (Repeat on Arp 4th) at 1:20AM and 1PM on Vibe TV. Rgds #PTI ! Watch PTI on April 3rd (5) Rao Fahad at 9PM on Express News (6) Dr Seems Zia at 10:30PM on Health TV. Rgds #PTI As you can see by quickly comparing the two source files (PTITVProgs and new_tweets) that the difference between them are the 3 tweets that were on April 7th and 3 tweets on April 3rd.
I just want the lines in new_tweets that are not in PTITVProgs to appear in the diff.
But it throws a bunch of text that I don't want to see. I don't know what *** 1,7*** and *** 1,3*** in the diff output stand for...? What is the proper way to get only the changed lines?
863
Difflib is a Python module that contains several easy-to-use functions and classes that allow users to compare sets of data. The module presents the results of these sequence comparisons in a human-readable format, utilizing deltas to display the differences more cleanly.
Difflib is a built-in module in the Python programming language consisting of different simple functions and classes that allow users to compare data sets. The module offers the outputs of these sequence comparisons in a format that can be read by a human, using deltas to show the differences more efficiently.
Just parse output of diff like this (change '- ' to '+ ' if needed):
#!/usr/bin/env python # difflib_test import difflib file1 = 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 difflib f1 = '''1 2 3 4 5''' f2 = '''1 3 4 5 6''' diff = difflib.ndiff(f1,f2) for l in diff: print(l) Output:
1 - 2 3 4 5 + 6 EDIT:
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 If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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