flake8 fix
flake8 fix

pllim/astropy,astropy/astropy,bsipocz/astropy,larrybradley/astropy,dhomeier/astropy,pllim/astropy,lpsinger/astropy,larrybradley/astropy,pllim/astropy,MSeifert04/astropy,lpsinger/astropy,StuartLittlefair/astropy,bsipocz/astropy,bsipocz/astropy,astropy/astropy,stargaser/astropy,mhvk/astropy,lpsinger/astropy,saimn/astropy,astropy/astropy,dhomeier/astropy,aleksandr-bakanov/astropy,astropy/astropy,saimn/astropy,StuartLittlefair/astropy,larrybradley/astropy,mhvk/astropy,MSeifert04/astropy,lpsinger/astropy,saimn/astropy,mhvk/astropy,larrybradley/astropy,dhomeier/astropy,stargaser/astropy,StuartLittlefair/astropy,MSeifert04/astropy,lpsinger/astropy,MSeifert04/astropy,bsipocz/astropy,larrybradley/astropy,aleksandr-bakanov/astropy,astropy/astropy,aleksandr-bakanov/astropy,stargaser/astropy,dhomeier/astropy,mhvk/astropy,aleksandr-bakanov/astropy,mhvk/astropy,pllim/astropy,StuartLittlefair/astropy,StuartLittlefair/astropy,dhomeier/astropy,pllim/astropy,stargaser/astropy,saimn/astropy,saimn/astropy