resolves issue #1542
resolves issue #1542

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