rsolve_poly: Fix python 3 failure.
rsolve_poly: Fix python 3 failure.

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