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catalyst/zipline
Eddie Hebert 803b58c8aa MAINT: More precise extraction of returns from returns container.
Use slice to date, `[:dt]` instead of `pd.Series.valid` to extract
from returns containers.

Using `valid` lead to some confusion when debugging tests, because
it papers over missing data.

The use of `.valid` was based on the assumption that all values
from the zeroth date to the current algo date are populated,
with no trailing values.
`[:dt]` extracts the same data, but in a hopefully more precise
and explicit fashion.
2014-03-21 17:22:10 -04:00
..
2014-01-30 16:47:27 -05:00