[svn r38514] rewrite/refactor why_py (it was quite old)
[svn r38514] rewrite/refactor why_py (it was quite old)

--HG--
branch : trunk

ddboline/pytest,ghostsquad/pytest,Haibo-Wang-ORG/pytest,bubenkoff/pytest,txomon/pytest,Haibo-Wang-ORG/pytest,Akasurde/pytest,markshao/pytest,davidszotten/pytest,JonathonSonesen/pytest,hunse/pytest,RonnyPfannschmidt/pytest,takluyver/pytest,Magicjarvis/py,codewarrior0/pytest,hpk42/pytest,rouge8/pytest,eli-b/pytest,gabrielcnr/pytest,oleg-alexandrov/pytest,ericdill/pytest,takluyver/pytest,Bjwebb/pytest,abusalimov/pytest,Bachmann1234/pytest,MengJueM/pytest,tomviner/pytest,pytest-dev/pytest,oleg-alexandrov/pytest,nicoddemus/pytest,doordash/pytest,malinoff/pytest,ojake/pytest,flub/pytest,codewarrior0/pytest,skylarjhdownes/pytest,chillbear/pytest,nicoddemus/repo-test,lukas-bednar/pytest,mhils/pytest,abusalimov/pytest,hpk42/pytest,lukas-bednar/pytest,jb098/pytest,hunse/pytest,ionelmc/pytest,JonathonSonesen/pytest,ghostsquad/pytest,ionelmc/pytest,MengJueM/pytest,mbirtwell/pytest,tgoodlet/pytest,mdboom/pytest,wfxiang08/pytest,etataurov/pytest,untitaker/pytest,vmalloc/dessert,Carreau/pytest,tomviner/pytest,Bjwebb/pytest,mhils/pytest,doordash/pytest,rmfitzpatrick/pytest,mdboom/pytest,bukzor/pytest,pfctdayelise/pytest,wfxiang08/pytest,inirudebwoy/pytest,userzimmermann/pytest,The-Compiler/pytest,chiller/pytest,chillbear/pytest,ropez/pytest,omarkohl/pytest,hackebrot/pytest,icemac/pytest,ericdill/pytest,The-Compiler/pytest,untitaker/pytest,vodik/pytest,pytest-dev/py,nicoddemus/pytest,Carreau/pytest,jb098/pytest,ropez/pytest,Bachmann1234/pytest,userzimmermann/pytest,bubenkoff/pytest,alfredodeza/pytest,nicoddemus/repo-test,tareqalayan/pytest,inirudebwoy/pytest,MichaelAquilina/pytest,mbirtwell/pytest,icemac/pytest,chiller/pytest,ojake/pytest,jaraco/pytest,vodik/pytest,pelme/pytest,pelme/pytest,rouge8/pytest,gabrielcnr/pytest,omarkohl/pytest,bukzor/pytest