Since people seem to like Sentdex's tutorial for Quantopian, and they have not been updated for Quantopian 2- I thought updating them would be valuable to people here and a good way to finally learn Quantopian!
This first algorithm is a simple long-only trend following strategy. It highlights two of the major changes between Quantopian 1 and Quantopian 2 First,
data[asset].mavg(days) has been replaced with
data.history(asset, 'price', days, '1d').mean(). Second, his
handle_data function should be replaced with a scheduled
Potential "Gotchya": When called before trading, like in
data.history(asset,'price', 10,'1d') does exactly what you expect: return the closing price for the previous 10 days. However, if it is called during trading, i.e. in either a
handle_data call or scheduled
rebalancd call, then it returns the most recent price observed in trading today and the closing price for the previous 9 days. (If you ever have questions about what's being returned, I found setting a debug-point and using
get_datetime() to be useful to make sure I was working with the correct data.)
OH, and I much prefer my order entry logic and design pattern over his, but let me know if you feel otherwise.