import plotly.graph_objects as go
from vnpy_scripttrader import init_cli_trading
from vnpy_ctp import CtpGateway
from vnpy.trader.utility import load_json
from vnpy.trader.constant import OptionType
from vnpy.trader.object import SubscribeRequest
setting = load_json("connect_ctp.json")
engine = init_cli_trading([CtpGateway])
engine.connect_gateway(setting, 'CTP')
contract = engine.get_contract("cu2311.SHFE")
tick = engine.get_tick("cu2311.SHFE")
p = tick.last_price
p的值输出不了，报错
AttributeError: 'NoneType' object has no attribute 'last_price'
simnow下面用jupyter lab测试，
一步步试，
contract可以返回相应的值
tick就什么也没有
继续什么last_price等等，都输出不了
