Fix test failure with Python 2.6
Fix test failure with Python 2.6

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