In polyclasses.py, don't use `except as`.
In polyclasses.py, don't use `except as`.

`as` is not yet a keyword in Python 2.5.

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