tentatively fix py33 and py25 compat
tentatively fix py33 and py25 compat

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