How do I customize my own Sizer and calculate the size for the long or short position ?

[ramoslin02]

I backtest my own strategy, and customize my own sizer like following:

    class MySizer(bt.Sizer):
        def _getsizing(self, comminfo, cash, data, isbuy):
            size = cash*0.96/data.close[1]
            return size

the above is for the long position, but how do I customize the short position ? maybe for the using the leverage . Thanks .

[backtrader]

@ramoslin02 said in How do I customize my own Sizer and calculate the size for the long or short position ?:

the above is for the long position, but how do I customize the short position ?

By checking the parameter isbuy which tells you if the sizing operation is for a buy order. Else it will be a sell

See Docs - Sizers - Smart Staking