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xdiff in python (Python recipe) by Hiro
ActiveState Code (http://code.activestate.com/recipes/578324/)

xdiff.py compares and output difference of file1 and file2. it finds out the lines that are unique in file1 and files2, the finding is written to file3 and file4 respectively.

Python, 94 lines
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#version 0
import sys

f1 = open(sys.argv[1], "r")
f2 = open(sys.argv[2], "r")

fileOne = f1.readlines()
fileTwo = f2.readlines()

f1.close()
f2.close()

outFile1 = open(sys.argv[3], "w")
outFile2 = open(sys.argv[4], "w")

for i in fileOne:
        if not i in fileTwo:
                outFile1.write(i)

for i in fileTwo:
        if not i in fileOne:
                outFile2.write(i)

outFile1.close()
outFile2.close()

#first time refacotring 
import sys
from operator import attrgetter,itemgetter

#verify inputs
USAGE='''
%s file1 file2 output1 output2
'''% __file__

if len(sys.argv)<5:
        print USAGE
        sys.exit(2)

#open files with try
try:
        f1 = open(sys.argv[1], "r")
        f2 = open(sys.argv[2], "r")
except Exception,e:
        print 'encounter issues %s, while opening in files: %s %s' % (str(e),itemgetter(1)(sys.argv),itemgetter(2)(sys.argv))
        sys.exit(1)

fileOne = f1.readlines()
fileTwo = f2.readlines()

f1.close()
f2.close()

#open files with try
try:
        outFile1 = open(sys.argv[3], "w")
        outFile2 = open(sys.argv[4], "w")
except Exception,e:
        print 'encounter issues %s, while opening out files: %s %s' % (str(e),itemgetter(3)(sys.argv),itemgetter(4)(sys.argv))
        sys.exit(1)

l_minus=lambda x,y:list(set(x)-set(y))

outFile1.write('\n'.join(l_minus(fileOne,fileTwo)))
outFile2.write('\n'.join(l_minus(fileTwo,fileOne)))

outFile1.close()
outFile2.close()


#2nd time refactoring
import sys
from operator import attrgetter,itemgetter

#verify inputs
USAGE='''
%s file1 file2 output1 output2
'''% __file__

if len(sys.argv)<5:
        print USAGE
        sys.exit(2)

#open files with try
with open(itemgetter(1)(sys.argv), "r") as f1, open(itemgetter(2)(sys.argv), "r") as f2:
        fileOne = f1.readlines()
        fileTwo = f2.readlines()

#list subset
l_minus=lambda x,y:list(set(x)-set(y))
#open files with try
with open(itemgetter(3)(sys.argv), "w") as outFile1, open(itemgetter(4)(sys.argv), "w") as outFile2:
        outFile1.write('\n'.join(l_minus(fileOne,fileTwo)))
        outFile2.write('\n'.join(l_minus(fileTwo,fileOne)))
Tags: file, process