Fix doctest runner to correctly not test .txt file in Python 2.4
Fix doctest runner to correctly not test .txt file in Python 2.4

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