High level scan API.

        :param filter_builder: filter expression builder.
        :type filter_builder: :class:`~bynamodb.filterexps.Operator`

def scan(cls, filter_builder=None, **scan_filter):
        """High level scan API.

        :param filter_builder: filter expression builder.
        :type filter_builder: :class:`~bynamodb.filterexps.Operator`

        """
        scan_kwargs = {'scan_filter': build_condition(scan_filter)}
        if filter_builder:
            cls._build_filter_expression(filter_builder, scan_kwargs)
        return ResultSet(cls, 'scan', scan_kwargs)