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research platform notebook error

In the attached notebook, Cell 12, when I do:

symbols('AAPL')  

I get the error:

'list' object is not callable
```.

However, if I open up a new notebook, symbols('AAPL') works.  
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2 responses

Hi Grant. Isn't it just getting confused between "symbols" the list of tickers you've created, and "symbols" the Quantopian research function that returns a list of security objects? If you change your ticker list to something else, this should work fine.

Thanks. That must be it. Seems that the research environment should have flagged 'symbols' as a protected object when I first used it. --Grant