Python Iterator & argparse example

import argparse
import sys

class Config(object):
    def __init__(self, fileLoc):
        self.configFile = open(fileLoc, 'r')

    def __iter__(self):
        return self

    def next(self):
        # throws StopIteration exception
        line = self.configFile.next()
        # TODO: change line here
        return line

def main(fileLoc):
    config = Config(fileLoc)
    for line in config:
        sys.stdout.write(line)

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='parse a file')
    parser.add_argument('file', help='file to parse')
    args = parser.parse_args()
    main(args.file)