django1/django/contrib/postgres/serializers.py

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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}