Return the value for the queried field.

        Get the value of a given field. The list of all queryable fields is
        documented in the beginning of the model class.

        >>> out = m._get('graph')

        Parameters
        ----------
        field : string
            Name of the field to be retrieved.

        Returns
        -------
        out : value
            The current value of the requested field.

def _get(self, field):
        """
        Return the value for the queried field.

        Get the value of a given field. The list of all queryable fields is
        documented in the beginning of the model class.

        >>> out = m._get('graph')

        Parameters
        ----------
        field : string
            Name of the field to be retrieved.

        Returns
        -------
        out : value
            The current value of the requested field.
        """
        if field in self._list_fields():
            return self.__proxy__.get(field)
        else:
            raise KeyError('Key \"%s\" not in model. Available fields are %s.' % (field, ', '.join(self._list_fields())))