开仓均价、开仓成本、持仓量改为position，为什么仍然会出现错误提示？

from tqsdk import TqApi, TqAccount, TqSim

api = TqApi(TqSim())

position=api.get_position()

print(“多开均价: %.2f” % (Position.open_price_long))
NameError: name ‘Position’ is not defined