DOC: Clarify how AssetExists() is special.

This commit is contained in:
Scott Sanderson
2016-08-12 13:09:04 -04:00
parent b6bacd2815
commit 14a95449ca
+3
View File
@@ -320,6 +320,9 @@ class AssetExists(Term):
every asset on every date. We don't subclass Filter, however, because
`AssetExists` is computed directly by the PipelineEngine.
This term is guaranteed to be available as an input for any term computed
by SimplePipelineEngine.run_pipeline().
See Also
--------
zipline.assets.AssetFinder.lifetimes