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Cloned an old algo, trying to migrate it

Took this thread and the example algo from Seong Lee here:

https://www.quantopian.com/posts/looping-to-compare-all-stocks-to-pick-highest-gainer

And I've gotten through updating the "set universe" to a pipeline but needing some help with the syntax error on line 106:

 104       for stock in data:  
 105           context.daily_stocks[stock] = (data.current([stock],price)/(context.daily_stocks[stock])  
 106       winner = max(context.daily_stocks.values())  

I was thinking that this would have to become:
winner = max(data.current(context.daily_stocks,price)

but that is not working. I would appreciate the help as I feel I'm misinterpreting how the "context." is used.

Thanks in advance!