def METHOD_NAME(self):
    self.new_config = []
    self.config = []
    try:
        for line in open(self.filename):
            self.new_config.append(line)
    except IOError:
        logging.debug("File %s does not exist" % self.filename)
    else:
        logging.debug("Reading file %s" % self.filename)
        self.config = list(self.new_config)