@vladisld Thanks a lot!

@vladisld Thanks a lot!

Placing an order at market price sometimes get a very poor price. However, limited price order may not be executed. The IB "Adaptive" order at market price maybe a good balance between market and limited price order. However, I can't find any information from online document nor forum. Does BackTrader support such order type? Thank you.

By referencing the sample code ibtest.py, I can get live data from IB. However, I try to place a buy order throught the paper account, but can't make the trade successfully. I also can't get the position.

I got the following order information. It's ordered with market price. However, I tried other limited price order but failed as well. Could anyone give me some hints/suggestions? Thank you.

-------------------------------------------------- ORDER BEGIN 2021-02-10 23:15:15.729882
Ref: 28
OrdType: 0
OrdType: Buy
Status: 1
Status: Submitted
Size: 1
Price: None
Price Limit: None
TrailAmount: None
TrailPercent: None
ExecType: 0
ExecType: Market
CommInfo: None
End of Session: 737831.6666666665
Info: AutoOrderedDict()
Broker: None
Alive: True
-------------------------------------------------- ORDER END
-------------------------------------------------- ORDER BEGIN 2021-02-10 23:15:15.732300
Ref: 28
OrdType: 0
OrdType: Buy
Status: 7
Status: Margin
Size: 1
Price: None
Price Limit: None
TrailAmount: None
TrailPercent: None
ExecType: 0
ExecType: Market
CommInfo: None
End of Session: 737831.6666666665
Info: AutoOrderedDict()
Broker: None
Alive: False
-------------------------------------------------- ORDER END

@rajanprabu Can I understand the mechanism as: the SMA indicator can be put in init section of the ibtest.py example because the build-in SMA indicator implemented the "next" method. When live data fits in, Cerebro calls the next() method of the SMA indicator to update the indicator value. Is it correct?

Thanks rajanprabu and vladisld. That means, if live data is involved, and I want my backtesting strategy to be reusable in live data environment, I can't put my indicator calculations (usually in the form of array operations) in init. I must rewrite those indicators as methods, which accepts data feeds in each iteration of "next"

I'm going to add live data fetching to my code. I read the example "sample\ibtest\ibtest.py" and have a question:

In the class: TestStrategy of the sample code, it contain a SMA calculation in the init of the TestStrategy class:

self.sma = bt.indicators.MovAv.SMA(self.data, period=self.p.smaperiod)

Because the init run once only (during the TestStrategy class instance creation). However, the real time data (i.e. self.data) updates continuously, how can the "self.sma" be reflected, as init run once only?

Thank you, rajanprabu. You're right, I'm using a wrong bracket...

I'm a newbie to Backtrader and just developed my first custom indicator (I mainly follow the samples at https://community.backtrader.com/topic/2145/full-example-of-custom-indicator/5)

However, when I try to compare indicator values, e.g. lazy is my custom indicator, and I try to compare the values of itself one units ago, i.e.

    self.lazy(-1)>self.lazy(0)

I got the following error message:

bool should return bool, returned LineOwnOperation

I know the custom indicator is actually a line object. How can I get the value of it?