def has_option(self, option):
        """
        Return True if the option is included in this key.

        Parameters
        ----------
        option : str
            The option.

        Returns
        -------
        has : bool
            True if the option can be found. Otherwise False will be returned.

        """
        if len(self.options) == 0:
            return False
        for op in self.options:
            if (self._sized_op and op[0] == option) or (op == option):
                return True
        return False