Use get instead of setdefault.  Addreses #640
Use get instead of setdefault.  Addreses #640

debsankha/networkx,beni55/networkx,goulu/networkx,kai5263499/networkx,bzero/networkx,kernc/networkx,SanketDG/networkx,sharifulgeo/networkx,RMKD/networkx,dmoliveira/networkx,dmoliveira/networkx,ltiao/networkx,NvanAdrichem/networkx,ghdk/networkx,nathania/networkx,OrkoHunter/networkx,bzero/networkx,chrisnatali/networkx,jni/networkx,sharifulgeo/networkx,jakevdp/networkx,bzero/networkx,dhimmel/networkx,blublud/networkx,jtorrents/networkx,kernc/networkx,kai5263499/networkx,JamesClough/networkx,harlowja/networkx,farhaanbukhsh/networkx,aureooms/networkx,ghdk/networkx,dhimmel/networkx,RMKD/networkx,jakevdp/networkx,jni/networkx,michaelpacer/networkx,aureooms/networkx,ionanrozenfeld/networkx,cmtm/networkx,debsankha/networkx,tmilicic/networkx,sharifulgeo/networkx,RMKD/networkx,kai5263499/networkx,andnovar/networkx,jni/networkx,debsankha/networkx,nathania/networkx,jcurbelo/networkx,ghdk/networkx,nathania/networkx,harlowja/networkx,wasade/networkx,yashu-seth/networkx,blublud/networkx,jfinkels/networkx,Sixshaman/networkx,ionanrozenfeld/networkx,harlowja/networkx,dhimmel/networkx,dmoliveira/networkx,chrisnatali/networkx,farhaanbukhsh/networkx,blublud/networkx,chrisnatali/networkx,jtorrents/networkx,farhaanbukhsh/networkx,jakevdp/networkx,aureooms/networkx,ionanrozenfeld/networkx,kernc/networkx