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Problems with KeyError

When the algorithm runs on line 108 it says KeyError: 'already_used' when I tried to reference context.already_used. Could somebody please explain what the error is and how to fix it? I am relatively new with Quantopian so the formatting and the setup probably aren't very good.

Clone Algorithm
1
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Backtest from to with initial capital
Total Returns
--
Alpha
--
Beta
--
Sharpe
--
Sortino
--
Max Drawdown
--
Benchmark Returns
--
Volatility
--
Returns 1 Month 3 Month 6 Month 12 Month
Alpha 1 Month 3 Month 6 Month 12 Month
Beta 1 Month 3 Month 6 Month 12 Month
Sharpe 1 Month 3 Month 6 Month 12 Month
Sortino 1 Month 3 Month 6 Month 12 Month
Volatility 1 Month 3 Month 6 Month 12 Month
Max Drawdown 1 Month 3 Month 6 Month 12 Month
# Backtest ID: 59cab7e70a1bc75072bf9a04
There was a runtime error.
2 responses

Your problem was that on line 108, you looked for context.used_stocks but that variable had never been defined.

It looks like you intended to define context.used_stocks on line 94, but that was inside an if block that was never executed. I can't figure out what the intent of that if statement was, so I removed it, and now the algo runs.

Clone Algorithm
0
Loading...
Backtest from to with initial capital
Total Returns
--
Alpha
--
Beta
--
Sharpe
--
Sortino
--
Max Drawdown
--
Benchmark Returns
--
Volatility
--
Returns 1 Month 3 Month 6 Month 12 Month
Alpha 1 Month 3 Month 6 Month 12 Month
Beta 1 Month 3 Month 6 Month 12 Month
Sharpe 1 Month 3 Month 6 Month 12 Month
Sortino 1 Month 3 Month 6 Month 12 Month
Volatility 1 Month 3 Month 6 Month 12 Month
Max Drawdown 1 Month 3 Month 6 Month 12 Month
# Backtest ID: 59cd271d3a2eb6505aa28f6a
There was a runtime error.
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Thanks! I wouldn't have thought to do that myself.