Use py.builtin.callable
Use py.builtin.callable

This restores compatibility with Python 3.0/3.1

nicoddemus/pytest,rmfitzpatrick/pytest,nicoddemus/pytest,ddboline/pytest,vmalloc/dessert,hpk42/pytest,The-Compiler/pytest,tomviner/pytest,Akasurde/pytest,MichaelAquilina/pytest,pfctdayelise/pytest,tgoodlet/pytest,malinoff/pytest,alfredodeza/pytest,eli-b/pytest,tareqalayan/pytest,tomviner/pytest,flub/pytest,txomon/pytest,hpk42/pytest,pytest-dev/pytest,hackebrot/pytest,davidszotten/pytest,skylarjhdownes/pytest,markshao/pytest,RonnyPfannschmidt/pytest,jaraco/pytest,The-Compiler/pytest,etataurov/pytest