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【Python】比较两个文件的差异

作者:Dezai.CN / 发布于2013/6/8/ 816


	#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)))

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