adding implementation of interchange
adding implementation of interchange

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