def get_opt(self, opt):
        """Get value of option from configuration file

        Parameters
        -----------
        opt : string
            Name of option (e.g. output-file-format)

        Returns
        --------
        value : string
            The value for the option. Returns None if option not present.
        """
        for sec in self.sections:
            try:
                key = self.cp.get(sec, opt)
                if key:
                    return key
            except ConfigParser.NoOptionError:
                pass

        return None
Get value of option from configuration file

        Parameters
        -----------
        opt : string
            Name of option (e.g. output-file-format)

        Returns
        --------
        value : string
            The value for the option. Returns None if option not present.