PERF: Remove attribute access in inner loop.
PERF: Remove attribute access in inner loop.

humdings/zipline,florentchandelier/zipline,quantopian/zipline,Scapogo/zipline,alphaBenj/zipline,florentchandelier/zipline,alphaBenj/zipline,humdings/zipline,bartosh/zipline,enigmampc/catalyst,bartosh/zipline,Scapogo/zipline,enigmampc/catalyst,quantopian/zipline