PERF: Remove in operator from inner loop.
PERF: Remove in operator from inner loop.

Ask forgiveness via exception handling instead.

CarterBain/AlephNull,wubr2000/zipline,gwulfs/zipline,cmorgan/zipline,otmaneJai/Zipline,florentchandelier/zipline,wilsonkichoi/zipline,jimgoo/zipline-fork,StratsOn/zipline,DVegaCapital/zipline,zhoulingjun/zipline,michaeljohnbennett/zipline,wubr2000/zipline,erikness/AlephOne,iamkingmaker/zipline,michaeljohnbennett/zipline,enigmampc/catalyst,morrisonwudi/zipline,AlirezaShahabi/zipline,iamkingmaker/zipline,DVegaCapital/zipline,jimgoo/zipline-fork,umuzungu/zipline,gwulfs/zipline,grundgruen/zipline,stkubr/zipline,mattcaldwell/zipline,cmorgan/zipline,mattcaldwell/zipline,keir-rex/zipline,humdings/zipline,jordancheah/zipline,aajtodd/zipline,ChinaQuants/zipline,Scapogo/zipline,keir-rex/zipline,zhoulingjun/zipline,bartosh/zipline,ronalcc/zipline,dhruvparamhans/zipline,davidastephens/zipline,AlirezaShahabi/zipline,nborggren/zipline,dkushner/zipline,magne-max/zipline-ja,joequant/zipline,morrisonwudi/zipline,YuepengGuo/zipline,semio/zipline,ChinaQuants/zipline,euri10/zipline,dkushner/zipline,YuepengGuo/zipline,dhruvparamhans/zipline,nborggren/zipline,bartosh/zipline,sketchytechky/zipline,MonoCloud/zipline,joequant/zipline,magne-max/zipline-ja,euri10/zipline,CDSFinance/zipline,aajtodd/zipline,CDSFinance/zipline,quantopian/zipline,davidastephens/zipline,CarterBain/AlephNull,humdings/zipline,dmitriz/zipline,wilsonkichoi/zipline,enigmampc/catalyst,StratsOn/zipline,chrjxj/zipline,florentchandelier/zipline,dmitriz/zipline,quantopian/zipline,kmather73/zipline,kmather73/zipline,chrjxj/zipline,sketchytechky/zipline,grundgruen/zipline,alphaBenj/zipline,ronalcc/zipline,semio/zipline,umuzungu/zipline,Scapogo/zipline,jordancheah/zipline,alphaBenj/zipline,stkubr/zipline,otmaneJai/Zipline,MonoCloud/zipline,erikness/AlephOne