improve code
improve code

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