(self)
return self._facetmaps.keys()
Returns the available facet names, for use with the ``groups()``
        method.
Returns the available facet names, for use with the ``groups()``
        method.
Returns the available facet names for use with the groups () method .
def facet_names(self):
        """Returns the available facet names, for use with the ``groups()``
        method.
        """

        return self._facetmaps.keys()
def facet_names ( self ) : return self . _facetmaps . keys ( )