def _get_postgres_version(self):
        if self._postgres_version is None:
            from django.db.backends.postgresql.version import get_version
            cursor = self.connection.cursor()
            self._postgres_version = get_version(cursor)
        return self._postgres_version
dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/db/backends/postgresql/operations.py/DatabaseOperations._get_postgres_version/original