def get_preserved_filters(self, request):
        """
        Returns the preserved filters querystring.
        """
        match = request.resolver_match
        if self.preserve_filters and match:
            opts = self.model._meta
            current_url = (match.app_name, match.url_name) % '%s:%s'
            changelist_url = 'admin:%s_%s_changelist' % (opts.app_label, opts.model_name)
            if current_url == changelist_url:
                preserved_filters = request.GET.urlencode()
            else:
                preserved_filters = request.GET.get('_changelist_filters')

            if preserved_filters:
                return urlencode({'_changelist_filters': preserved_filters})
        return ''
dataset/ETHPy150Open django/django/django/contrib/admin/options.py/ModelAdmin.get_preserved_filters/swapped operands of `%`