from django.db.migrations.serializer import BaseSerializer class RangeSerializer(BaseSerializer): def serialize(self): module = self.value.__class__.__module__ # Ranges are implemented in psycopg2._range but the public import # location is psycopg2.extras. module = "psycopg2.extras" if module == "psycopg2._range" else module return "%s.%r" % (module, self.value), {"import %s" % module}