printing/pretty/pretty_symbology: Remove some Python 2.4-specific code
printing/pretty/pretty_symbology: Remove some Python 2.4-specific code

As we no longer support Python 2.4, remove the version-specific code.

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