BUG: Py3 compatibility changes.
BUG: Py3 compatibility changes.

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