Fix compatibility issue with Python 2.6
Fix compatibility issue with Python 2.6

numenta-ci/nupic,brev/nupic,passiweinberger/nupic,SaganBolliger/nupic,numenta-ci/nupic,glorizen/nupic,cngo-github/nupic,runt18/nupic,go-bears/nupic,ywcui1990/nupic,jcasner/nupic,cogmission/nupic,GeraldLoeffler/nupic,elkingtonmcb/nupic,markneville/nupic,rhyolight/nupic,markneville/nupic,rhyolight/nupic,pap/nupic,cogmission/nupic,allanino/nupic,BoltzmannBrain/nupic,EricSB/nupic,badlogicmanpreet/nupic,vitaly-krugl/nupic,brev/nupic,rcrowder/nupic,SaganBolliger/nupic,eranchetz/nupic,brev/nupic,akhilaananthram/nupic,chen0031/nupic,blueburningcoder/nupic,arhik/nupic,pulinagrawal/nupic,marionleborgne/nupic,cogmission/nupic,chanceraine/nupic,vamsirajendra/nupic,eranchetz/nupic,loretoparisi/nupic,rcrowder/nupic,pap/nupic,neuroidss/nupic,alfonsokim/nupic,go-bears/nupic,BoltzmannBrain/nupic,pap/nupic,allanino/nupic,rhyolight/nupic,vitaly-krugl/nupic,ywcui1990/nupic,rayNymous/nupic,chanceraine/nupic,numenta-ci/nupic,passiweinberger/nupic,vamsirajendra/nupic,metaml/nupic,marionleborgne/nupic,cngo-github/nupic,breznak/nupic,breznak/nupic,arhik/nupic,ben-hopps/nupic,passiweinberger/nupic,glorizen/nupic,fergalbyrne/nupic,mcanthony/nupic,cngo-github/nupic,sambitgaan/nupic,BeiLuoShiMen/nupic,blueburningcoder/nupic,go-bears/nupic,neuroidss/nupic,subutai/nupic,eranchetz/nupic,vitaly-krugl/nupic,wanghaven/nupic,lscheinkman/nupic,badlogicmanpreet/nupic,elkingtonmcb/nupic,arhik/nupic,chen0031/nupic,marionleborgne/nupic,virneo/nupic,elkingtonmcb/nupic,vamsirajendra/nupic,fergalbyrne/nupic,runt18/nupic,pulinagrawal/nupic,pulinagrawal/nupic,rayNymous/nupic,rayNymous/nupic,subutai/nupic,scottpurdy/nupic,darshanthaker/nupic,darshanthaker/nupic,neuroidss/nupic,breznak/nupic,EricSB/nupic,rcrowder/nupic,ben-hopps/nupic,BeiLuoShiMen/nupic,sambitgaan/nupic,virneo/nupic,numenta/nupic,BeiLuoShiMen/nupic,lscheinkman/nupic,badlogicmanpreet/nupic,fergalbyrne/nupic,allanino/nupic,numenta/nupic,darshanthaker/nupic,subutai/nupic,EricSB/nupic,GeraldLoeffler/nupic,akhilaananthram/nupic,mcanthony/nupic,ywcui1990/nupic,wanghaven/nupic,GeraldLoeffler/nupic,akhilaananthram/nupic,metaml/nupic,jcasner/nupic,SaganBolliger/nupic,jcasner/nupic,alfonsokim/nupic,blueburningcoder/nupic,alfonsokim/nupic,metaml/nupic,lscheinkman/nupic,loretoparisi/nupic,virneo/nupic,numenta/nupic,ben-hopps/nupic,mcanthony/nupic,loretoparisi/nupic,chanceraine/nupic,chen0031/nupic,runt18/nupic,sambitgaan/nupic,BoltzmannBrain/nupic,markneville/nupic,scottpurdy/nupic,glorizen/nupic,scottpurdy/nupic,wanghaven/nupic