Add shape attribute to Argument
Add shape attribute to Argument

Converts (2, 3) to [2][3]

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