python类NamedTupleConnection()的实例源码

def test_error_message(self):
        try:
            from collections import namedtuple          # noqa
        except ImportError:
            # an import error somewhere
            from psycopg2.extras import NamedTupleConnection
            try:
                self.conn = self.connect(
                    connection_factory=NamedTupleConnection)
                curs = self.conn.cursor()
                curs.execute("select 1")
                curs.fetchone()
            except ImportError:
                pass
            else:
                self.fail("expecting ImportError")
        else:
            return self.skipTest("namedtuple available")