python - Return stock symbol in quantopian -

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i working on algo in quantopian , ran problem.

i calculated z-score's weighted % price change group of etf's , trying find ten best stocks. when run code

print(context.zscore)

it gives me data in 2 columns, symbol , zscore. however, when index no longer gives me symbol, zscore

print(context.zscore[0])

here's screenshot of output, first line indexed , second through nth line not. enter image description here

i want return 

equity(14516 [ewa])     -.679217

or better

ewa      -.679217

does know how this?

to solve problem it's pretty simple. use [[]]


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