fixed test in python3
fixed test in python3

DougBurke/astropy,kelle/astropy,dhomeier/astropy,MSeifert04/astropy,saimn/astropy,astropy/astropy,funbaker/astropy,larrybradley/astropy,funbaker/astropy,dhomeier/astropy,joergdietrich/astropy,saimn/astropy,larrybradley/astropy,kelle/astropy,stargaser/astropy,saimn/astropy,larrybradley/astropy,AustereCuriosity/astropy,pllim/astropy,lpsinger/astropy,MSeifert04/astropy,mhvk/astropy,bsipocz/astropy,joergdietrich/astropy,mhvk/astropy,mhvk/astropy,lpsinger/astropy,aleksandr-bakanov/astropy,lpsinger/astropy,DougBurke/astropy,bsipocz/astropy,astropy/astropy,aleksandr-bakanov/astropy,AustereCuriosity/astropy,pllim/astropy,AustereCuriosity/astropy,joergdietrich/astropy,stargaser/astropy,lpsinger/astropy,larrybradley/astropy,stargaser/astropy,tbabej/astropy,dhomeier/astropy,funbaker/astropy,tbabej/astropy,mhvk/astropy,funbaker/astropy,bsipocz/astropy,tbabej/astropy,pllim/astropy,StuartLittlefair/astropy,larrybradley/astropy,tbabej/astropy,dhomeier/astropy,StuartLittlefair/astropy,pllim/astropy,astropy/astropy,kelle/astropy,saimn/astropy,AustereCuriosity/astropy,aleksandr-bakanov/astropy,tbabej/astropy,bsipocz/astropy,lpsinger/astropy,astropy/astropy,aleksandr-bakanov/astropy,StuartLittlefair/astropy,saimn/astropy,StuartLittlefair/astropy,joergdietrich/astropy,kelle/astropy,MSeifert04/astropy,MSeifert04/astropy,mhvk/astropy,joergdietrich/astropy,kelle/astropy,stargaser/astropy,dhomeier/astropy,StuartLittlefair/astropy,DougBurke/astropy,DougBurke/astropy,AustereCuriosity/astropy,astropy/astropy,pllim/astropy