1++++
首先在回测代码中通过引擎属性赋值参数如下：
#%%
engine = BacktestingEngine()
engine.set_parameters(
vt_symbol="IH99.CFFEX",
interval="1m",
start=datetime(2019, 6, 1),
end=datetime(2019, 6, 30),
rate=0.3/10000,
slippage=0.2*5,
size=300,
pricetick=0.2,
capital=1_000_000,
collection_name = "IH99"
)
engine.add_strategy(AtrRsiStrategy, {})+
+
2+++++
AtrRsiStrategy策略中onbar如下：
def on_bar(self, bar: BarData):
"""
Callback of new bar data update.
"""
self.cancel_all()
df01=load_select_bar_data_from_mongodb(self.symbol,self.exchange,self.interval,(bar.datetime-timedelta(days=3)),
bar.datetime,self.collection_name)
print (df01)
self.put_event()注：load_select_bar_data_from_mongodb是自定义的从MongoDB数据库读取bardata并生成dataframe的函数，有关于symbol等参数需要传入。
+
+
+
3++++++++++
回测运行报错如下：
2020-11-30 22:50:43.167187 Traceback (most recent call last):
File "D:\vnpy-2.1.7\vnpy\app\cta_strategy\backtesting.py", line 315, in run_backtesting
self.callback(data)
File "D:\vnpy-2.1.7\vnpy\app\cta_strategy\strategies\atr_rsi_strategy.py", line 129, in on_bar
df01=load_select_bar_data_from_mongodb(self.symbol,self.exchange,self.interval,(bar.datetime-timedelta(days=3)),
AttributeError: 'AtrRsiStrategy' object has no attribute 'symbol'+
+
+
4++++++++++
所以想请教大佬们，如何让策略接受到上述回测引擎engine.set_parameters所设置的属性？
