It’s easier to decide when to buy than it is when to sell. For this reason it’s helpful to have systematic ways to evaluate when might be a good time to sell and/or rebalance. Even though the system will not be and cannot be perfect, it will probably be better than just letting emotion be in charge.
One effort in this regard is to discover what information is available. Trading systems looked into include Interactive Brokers’ TWS and Ameritrade’s Trade Station. Both reportedly have Python IDE’s that work on both Windows and Linux platforms.
