added lt operator to Tuples for py3 sorting
added lt operator to Tuples for py3 sorting

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