How to set the buy and sell signal in the graph

[edwardLui]

How to set buy and sell signal in the graph, here is the example..

Expected Behavior

[kernc]

Can you clarify your question? I don't think I get what you want exactly.

To use a signal-based strategy, you can use backtesting.lib.SignalStrategy as shown in one of the tutorials.

[eervin123]

I don't want to put words in @edwardLui Edward's mouth, but I believe he is looking for the option to add a "buy triangle" (green up triangle) at time of purchase, and a "sell triangle" (red down triangle) at time of sale on the price chart in the bt.plot() method.

This is nice, but I have come to appreciate the tractor beams @kernc created as the default as seen in the image below.

[kernc]

Was also thinking of adding trade entry markers to the P&L chart:

But we also have to watch out not to overwhelm Bokeh with too many objects, as with a couple thousand candles/trades the plot quickly becomes unruly and slow.