Check that data_class is a sub-class of DataIO
Check that data_class is a sub-class of DataIO

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