remove unnecessary import from docstring
remove unnecessary import from docstring

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