make _missing_extras and _available_extras staticmethods
make _missing_extras and _available_extras staticmethods
zorosteven/pip,sigmavirus24/pip,Gabriel439/pip,yati-sagade/pip,harrisonfeng/pip,willingc/pip,zvezdan/pip,techtonik/pip,pfmoore/pip,willingc/pip,rbtcollins/pip,RonnyPfannschmidt/pip,chaoallsome/pip,erikrose/pip,pypa/pip,mindw/pip,KarelJakubec/pip,jamezpolley/pip,chaoallsome/pip,jythontools/pip,jmagnusson/pip,rouge8/pip,ChristopherHogan/pip,harrisonfeng/pip,chaoallsome/pip,wkeyword/pip,jmagnusson/pip,natefoo/pip,mindw/pip,habnabit/pip,nthall/pip,davidovich/pip,jythontools/pip,squidsoup/pip,graingert/pip,qbdsoft/pip,nthall/pip,techtonik/pip,jasonkying/pip,alex/pip,esc/pip,zenlambda/pip,RonnyPfannschmidt/pip,dstufft/pip,prasaianooz/pip,atdaemon/pip,rbtcollins/pip,atdaemon/pip,tdsmith/pip,nthall/pip,qbdsoft/pip,Gabriel439/pip,haridsv/pip,zorosteven/pip,haridsv/pip,graingert/pip,sigmavirus24/pip,h4ck3rm1k3/pip,h4ck3rm1k3/pip,fiber-space/pip,wkeyword/pip,caosmo/pip,natefoo/pip,qbdsoft/pip,zvezdan/pip,habnabit/pip,luzfcb/pip,graingert/pip,rbtcollins/pip,blarghmatey/pip,ChristopherHogan/pip,zenlambda/pip,KarelJakubec/pip,sbidoul/pip,yati-sagade/pip,alex/pip,luzfcb/pip,jasonkying/pip,habnabit/pip,erikrose/pip,harrisonfeng/pip,ncoghlan/pip,benesch/pip,rouge8/pip,sigmavirus24/pip,dstufft/pip,Gabriel439/pip,prasaianooz/pip,davidovich/pip,jythontools/pip,squidsoup/pip,esc/pip,xavfernandez/pip,atdaemon/pip,h4ck3rm1k3/pip,natefoo/pip,jasonkying/pip,James-Firth/pip,supriyantomaftuh/pip,davidovich/pip,mujiansu/pip,haridsv/pip,alex/pip,jamezpolley/pip,willingc/pip,James-Firth/pip,yati-sagade/pip,pfmoore/pip,zvezdan/pip,xavfernandez/pip,prasaianooz/pip,luzfcb/pip,squidsoup/pip,ncoghlan/pip,tdsmith/pip,ncoghlan/pip,benesch/pip,jamezpolley/pip,mindw/pip,wkeyword/pip,RonnyPfannschmidt/pip,blarghmatey/pip,supriyantomaftuh/pip,mujiansu/pip,pradyunsg/pip,caosmo/pip,ChristopherHogan/pip,jmagnusson/pip,blarghmatey/pip,zorosteven/pip,fiber-space/pip,zenlambda/pip,fiber-space/pip,erikrose/pip,James-Firth/pip,KarelJakubec/pip,esc/pip,dstufft/pip,caosmo/pip,supriyantomaftuh/pip,sbidoul/pip,pradyunsg/pip,benesch/pip,mujiansu/pip,rouge8/pip,techtonik/pip,pypa/pip,xavfernandez/pip,tdsmith/pip