Allow construction of Idx from a string (for convenience)
Allow construction of Idx from a string (for convenience)

wanglongqi/sympy,kaichogami/sympy,srjoglekar246/sympy,kmacinnis/sympy,kevalds51/sympy,sampadsaha5/sympy,sampadsaha5/sympy,VaibhavAgarwalVA/sympy,jbbskinny/sympy,sunny94/temp,hrashk/sympy,Titan-C/sympy,kaichogami/sympy,AunShiLord/sympy,mafiya69/sympy,pandeyadarsh/sympy,vipulroxx/sympy,ChristinaZografou/sympy,toolforger/sympy,chaffra/sympy,AkademieOlympia/sympy,shipci/sympy,abhiii5459/sympy,shipci/sympy,ChristinaZografou/sympy,abloomston/sympy,beni55/sympy,kevalds51/sympy,Designist/sympy,Davidjohnwilson/sympy,chaffra/sympy,Curious72/sympy,minrk/sympy,jaimahajan1997/sympy,kevalds51/sympy,jaimahajan1997/sympy,emon10005/sympy,Vishluck/sympy,ga7g08/sympy,postvakje/sympy,abhiii5459/sympy,sahmed95/sympy,ahhda/sympy,lidavidm/sympy,jerli/sympy,jaimahajan1997/sympy,saurabhjn76/sympy,amitjamadagni/sympy,oliverlee/sympy,Sumith1896/sympy,asm666/sympy,pbrady/sympy,kmacinnis/sympy,sunny94/temp,Curious72/sympy,souravsingh/sympy,jerli/sympy,Shaswat27/sympy,yukoba/sympy,moble/sympy,Vishluck/sympy,atsao72/sympy,meghana1995/sympy,lidavidm/sympy,ahhda/sympy,yashsharan/sympy,maniteja123/sympy,lindsayad/sympy,hargup/sympy,sahilshekhawat/sympy,maniteja123/sympy,drufat/sympy,saurabhjn76/sympy,rahuldan/sympy,dqnykamp/sympy,AkademieOlympia/sympy,saurabhjn76/sympy,dqnykamp/sympy,liangjiaxing/sympy,iamutkarshtiwari/sympy,beni55/sympy,hargup/sympy,skidzo/sympy,pandeyadarsh/sympy,pbrady/sympy,mcdaniel67/sympy,diofant/diofant,grevutiu-gabriel/sympy,vipulroxx/sympy,MridulS/sympy,jamesblunt/sympy,yukoba/sympy,beni55/sympy,moble/sympy,garvitr/sympy,abloomston/sympy,mcdaniel67/sympy,atsao72/sympy,aktech/sympy,bukzor/sympy,Davidjohnwilson/sympy,cswiercz/sympy,iamutkarshtiwari/sympy,hrashk/sympy,jamesblunt/sympy,kaushik94/sympy,sahilshekhawat/sympy,amitjamadagni/sympy,madan96/sympy,kaushik94/sympy,shikil/sympy,cswiercz/sympy,bukzor/sympy,emon10005/sympy,mafiya69/sympy,chaffra/sympy,liangjiaxing/sympy,souravsingh/sympy,Titan-C/sympy,AunShiLord/sympy,jbbskinny/sympy,meghana1995/sympy,kumarkrishna/sympy,Arafatk/sympy,pbrady/sympy,maniteja123/sympy,drufat/sympy,Gadal/sympy,yashsharan/sympy,Sumith1896/sympy,Shaswat27/sympy,souravsingh/sympy,jerli/sympy,Gadal/sympy,kumarkrishna/sympy,drufat/sympy,wyom/sympy,Mitchkoens/sympy,vipulroxx/sympy,shipci/sympy,postvakje/sympy,toolforger/sympy,farhaanbukhsh/sympy,Mitchkoens/sympy,hrashk/sympy,oliverlee/sympy,aktech/sympy,flacjacket/sympy,cccfran/sympy,sunny94/temp,MridulS/sympy,skidzo/sympy,debugger22/sympy,shikil/sympy,dqnykamp/sympy,atsao72/sympy,grevutiu-gabriel/sympy,kaichogami/sympy,Curious72/sympy,emon10005/sympy,farhaanbukhsh/sympy,Shaswat27/sympy,MechCoder/sympy,yukoba/sympy,wanglongqi/sympy,asm666/sympy,minrk/sympy,pernici/sympy,atreyv/sympy,oliverlee/sympy,AunShiLord/sympy,moble/sympy,Davidjohnwilson/sympy,ga7g08/sympy,lindsayad/sympy,kumarkrishna/sympy,wyom/sympy,madan96/sympy,sahilshekhawat/sympy,asm666/sympy,sampadsaha5/sympy,cswiercz/sympy,rahuldan/sympy,garvitr/sympy,shikil/sympy,Gadal/sympy,kmacinnis/sympy,meghana1995/sympy,bukzor/sympy,VaibhavAgarwalVA/sympy,aktech/sympy,mafiya69/sympy,jbbskinny/sympy,abhiii5459/sympy,MridulS/sympy,wanglongqi/sympy,ChristinaZografou/sympy,yashsharan/sympy,lidavidm/sympy,Sumith1896/sympy,Titan-C/sympy,rahuldan/sympy,sahmed95/sympy,Designist/sympy,atreyv/sympy,atreyv/sympy,garvitr/sympy,Arafatk/sympy,lindsayad/sympy,toolforger/sympy,VaibhavAgarwalVA/sympy,debugger22/sympy,cccfran/sympy,mcdaniel67/sympy,Designist/sympy,farhaanbukhsh/sympy,jamesblunt/sympy,skidzo/sympy,ahhda/sympy,madan96/sympy,sahmed95/sympy,ga7g08/sympy,hargup/sympy,kaushik94/sympy,grevutiu-gabriel/sympy,MechCoder/sympy,debugger22/sympy,MechCoder/sympy,skirpichev/omg,AkademieOlympia/sympy,iamutkarshtiwari/sympy,liangjiaxing/sympy,pandeyadarsh/sympy,Mitchkoens/sympy,cccfran/sympy,postvakje/sympy,wyom/sympy,abloomston/sympy,Vishluck/sympy,Arafatk/sympy