doctests: add missing imports
doctests: add missing imports

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