Hi,
How would I set a constant and hold that constant?
For example. If I buy a stock at $50 and I want to sell it at 0.9 * 50.
You can't do something like
price_bought = data[context.security].price
because it will constantly set price_bought to the newest current price.
Hi Luke,
You can put variables that you need across handle_data calls as variables in context
So you could do something like
if (buy_signal):
context.order_id = order_value(context.security, amount_to_buy)
# Check the order to make sure that it has bought.
stock_order = get_order(context.order_id)
# The check below shows if the object exists. Only if it exists, should you
# refer to it. Otherwise you will get a runtime error
if stock_order:
context.price_bought = data[context.security].price
Quantopian also provides you the average cost you bought the stock at inside the portfolio details
context.portfolio.positions[stock].cost_basis
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