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catalyst/zipline
Andrew DanielsandGitHub 3136ef3f93 BUG: Fixes asset writer to the select the latest asset to hold a sid (#1392)
* BUG: Fixes asset writer to the select the latest asset to hold a sid

When constructing the asset_info dataframe, we were previously taking
the first symbol/sid pair to include, when we should be taking the most
recent.

* Ensure groups are sorted by increasing end_date

* Updates test_lookup_symbol_change_ticker to also cover asset_name
2016-08-15 20:38:02 -04:00
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