How best to track trade PNL

Eddy Bennett

I am struggling to work how how to output the PNL of a trade once it is in play, this is so that I can monitor a trade and close it if it's PNL reaches -1% of the account size.

I've been looking at the self.position variable which on output shows:

Position:  --- Position Begin
- Size: -66666
- Price: 1.54975
- Price orig: 0.0
- Closed: 0
- Opened: -66666
- Adjbase: 1.61085
--- Position End

The only aspect that seems to change on each iteration of next() is Adjbase, is that showing the change in price? If so I can work out the PNL from that perhaps.

I've dug around the docs but struggling to find the information I need, perhaps there is an easy way to do this? Any help appreciated.

Thanks

ab_trader

bt has trade object, therefore you can track trade pnl. I didn;t try it by myself, but as an idea - strategy has the attributes _tradespending and _trades which contains all trades. So it can be possible to get necessary data from there.

Useful links - Docs - Strategy and Docs - Broker - Trades.

Eddy Bennett

Ah perfect, thanks @ab_trader.

Eddy Bennett

How do you access the attribute values out of _trades? I've tried this:

        for k, v in self._trades.items():

           print(k.tradeid)

and get this error:

AttributeError: 'Lines_LineSeries_DataSeries_OHLC_OHLCDateTime_Abst' object has no attribute 'tradeid'