Simple MCP Maping Merger

import sys
import csv
import logging
import os
import shutil
from optparse import OptionParser

def main():
    parser = OptionParser(version='Blah')
    parser.add_option('-p', '--path', dest='path', help='The Method file')
    options, _ = parser.parse_args()
    merge('../MCP-1.1.0-Clean/conf/fields.csv', '%s/conf/fields.csv'%options.path, ['searge', 'name', 'notch', 'sig', 'notchsig', 'classname', 'classnotch', 'package', 'side'])
    merge('../MCP-1.1.0-Clean/conf/methods.csv', '%s/conf/methods.csv'%options.path, ['searge', 'name', 'notch', 'sig', 'notchsig', 'classname', 'classnotch', 'package', 'side'])

def merge(newFile, oldFile, sig):
        shutil.move(oldFile, '%s.back'%oldFile)
        csv.register_dialect('csvstyle', delimiter=',', quoting=csv.QUOTE_ALL)
        tCsv = csv.DictReader(open(newFile, 'rb'))
        newCsv = []
        for row in tCsv:
            newCsv.append(row)

        tCsv = csv.DictReader(open('%s.back'%oldFile, 'rb'))
        oldCsv = []
        for row in tCsv:
            oldCsv.append(row)

        for row1 in newCsv:
            for row2 in oldCsv:
                if (row2['searge'] == row1['searge'] and row2['side'] == row1['side']):
                    row2['name'] = row1['name']

        with open(oldFile, 'wb') as f:
            writer = csv.DictWriter(f, sig, dialect='csvstyle')
            writer.writerow(dict(zip(writer.fieldnames, writer.fieldnames)))
            writer.writerows(oldCsv)

        #os.remove('%s.back'%oldFile)

if __name__ == '__main__':
    main()