fix 'Index' object has no attribute 'get_values' bug #396
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When invoke the function
alphalens.tears.create_turnover_tear_sheetalphalens.tears.create_turnover_tear_sheet()
without allocating the paramturnover_period
, may cause theAttributeError: 'Index' object has no attribute 'get_values'
.It is because theutils.get_forward_returns_columns()
returns columns as an object ofIndex
instead ofpd.Series
.Hence,Index
object hasn't have functionget_values()
.