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Help on iterating ticker symbols in context
Tick green
posted Apr 9, 2018

Thank you guys for this amazing platform. It's fun to play with it. I am not a very experienced Python programmer, so I need some help now. Sorry for my unprofessional questions.
I think it was allowed to iterate data object to reference the ticker symbol of securities. But now, the data object is not iterable. How could I reference the ticker symbol of securities I pre-assigned (or fetched from CSVs) to context object?

The logic of my code is very simple:

def rebalance(context, data):  
    for my_equity in data:  
        if my_equity.symbol == my_trading_candidate_symbol:  
            equity_to_trade = my_equity
3 responses
Dan Whitnable
Apr 10, 2018

Hmm, do you simply want to get an equity object if you know the symbol? Assuming 'my_trading_candidate_symbol' is a string? If so, try this...

equity_to_trade = symbol(my_trading_candidate_symbol)

Check out the symbol method in the docs https://www.quantopian.com/help#api-symbol .

Tick green
Apr 10, 2018

Thank you very much Dan for the reply! Unfortunately, my_trading_candidate_symbol is a variable not a static string. I know quantopian has this restriction. This is making a simple problem complicated. Do I have to use pipeline instead?

Dan Whitnable
Apr 10, 2018

Ah yes. Forgot one can't use a variable with the 'symbol' method.

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