https://www.quantopian.com/tutorials/getting-started#lesson2
Copy the code to a notebook and it gives error on missing parameters - period_start, period_end in the following code
data_output = run_pipeline(
make_pipeline(),
start_date=period_start,
end_date=period_end
)
Hum, it assumes you've copied and ran the previous code block, where these variables are defined:
Research environment functions
from quantopian.research import returns, symbols
period_start = '2014-01-01'
period_end = '2014-12-31'
aapl_returns = returns(
assets=symbols('AAPL'),
start=period_start,
end=period_end,
)
aapl_returns.head(10)
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