Fix test for Python 3.x
Fix test for Python 3.x

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