pypy: don't use 'is' operator in ProductSet._contains
pypy: don't use 'is' operator in ProductSet._contains

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