def issuperset ( self , items ) : return all ( _compat . map ( self . _seen . __contains__ , items ) )
python set contains multiple items
Return whether this collection contains all items .
def issuperset(self, items):
        """Return whether this collection contains all items.

        >>> Unique(['spam', 'eggs']).issuperset(['spam', 'spam', 'spam'])
        True
        """
        return all(_compat.map(self._seen.__contains__, items))