Quick Questions regarding comissions

[GuacheSuede]

How may I set commissions/transaction costs based of no. of shares ?

How does backtrader differentiate between a short sell and long that checks how it applies the interest parameter from .setcommission ? (in realation to when i use the self.sell() method, how is it different from a normal sell, does backtrader keep track of previous positions/trades to perform the short operation ?)

Thanks for your time.

[backtrader]

This is all done with CommissionInfo objects (which can be quickly set via the broker or permanently customized with subclasses)

• Docs - Commissions
• Docs - Extending Comissions
• Docs - User Defined Commissions
• Docs - Commissions - Credit

@guachesuede said in Quick Questions regarding comissions:

How may I set commissions/transaction costs based of no. of shares ?

It is the standard mode. Choose if it is a percentage based commission or an absolute value one.

@guachesuede said in Quick Questions regarding comissions:

How does backtrader differentiate between a short sell and long that checks how it applies the interest parameter from .setcommission ?

See the documentation for Credit above.

@guachesuede said in Quick Questions regarding comissions:

in realation to when i use the self.sell() method, how is it different from a normal sell

There is no special and normal sell. There is only one. The CommissionInfo schemes control what happens.

@guachesuede said in Quick Questions regarding comissions:

does backtrader keep track of previous positions/trades to perform the short operation ?

backtrader keeps track of trades and positions. You are notified via notify_trade and you can always get the current position with getposition

• Docs - Strategy

[GuacheSuede]

@backtrader Thanks for the reply. May i ask how do i get a list of buy/sells made ? Or must it be manually managed ?

[backtrader]

You are notified of order execution in notify_order. Keep a reference to those that are interesting for you.