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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def filter(self, sites, rupture):
 """ Filter the site collection with respect to the rupture. :param sites: Instance of :class:`openquake.hazardlib.site.SiteCollection`. :param rupture: Instance of :class:`openquake.hazardlib.source.rupture.BaseRupture` :returns: (filtered sites, distance context) """

        distances = get_distances(rupture, sites, self.filter_distance)
        if self.maximum_distance:
            mask = distances <= self.maximum_distance(
                rupture.tectonic_region_type, rupture.mag)
            if mask.any():
                sites, distances = sites.filter(mask), distances[mask]
            else:
                raise FarAwayRupture(
                    '%d: %d km' % (rupture.serial, distances.min()))
        return sites, DistancesContext([(self.filter_distance, distances)])