Make an iterator using the ZSCAN command so that the client doesn't
        need to remember the cursor position.

        ``match`` allows for filtering the keys by pattern

        ``count`` allows for hint the minimum number of returns

        ``score_cast_func`` a callable used to cast the score return value

def zscan_iter(self, name, match=None, count=None,
                   score_cast_func=float):
        """
        Make an iterator using the ZSCAN command so that the client doesn't
        need to remember the cursor position.

        ``match`` allows for filtering the keys by pattern

        ``count`` allows for hint the minimum number of returns

        ``score_cast_func`` a callable used to cast the score return value
        """
        if self._pipe is not None:
            raise InvalidOperation('cannot pipeline scan operations')
        cursor = '0'
        while cursor != 0:
            cursor, data = self.zscan(name, cursor=cursor, match=match,
                                      count=count,
                                      score_cast_func=score_cast_func)
            for item in data:
                yield item