REPR0 decorator for test
REPR0 decorator for test

rationale:
----------

In tests, we need to check the behaviour of real __repr__ oftenly, but we set
Basic.set_repr_level(1) on sympy import time, so __repr__ goes to __str__,
which leads to confusion.

To avoid this in tests, I propose we use REPR0 decorator for functions needing
repr & str, and just use repr(...) and str(...) there.

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