fix exec statement in Py3
fix exec statement in Py3

ChristopherHogan/cython,hhsprings/cython,marscher/cython,JelleZijlstra/cython,bzzzz/cython,hickford/cython,larsmans/cython,JelleZijlstra/cython,scoder/cython,hickford/cython,bzzzz/cython,c-blake/cython,hhsprings/cython,fabianrost84/cython,scoder/cython,andreasvc/cython,slonik-az/cython,marscher/cython,JelleZijlstra/cython,roxyboy/cython,marscher/cython,fabianrost84/cython,rguillebert/CythonCTypesBackend,hhsprings/cython,achernet/cython,scoder/cython,dahebolangkuan/cython,c-blake/cython,hpfem/cython,acrispin/cython,andreasvc/cython,dahebolangkuan/cython,larsmans/cython,ChristopherHogan/cython,cython/cython,encukou/cython,JelleZijlstra/cython,dahebolangkuan/cython,JelleZijlstra/cython,slonik-az/cython,mcanthony/cython,fperez/cython,cython/cython,roxyboy/cython,larsmans/cython,larsmans/cython,mrGeen/cython,rguillebert/CythonCTypesBackend,madjar/cython,roxyboy/cython,fperez/cython,hpfem/cython,hickford/cython,madjar/cython,scoder/cython,rguillebert/CythonCTypesBackend,da-woods/cython,hpfem/cython,da-woods/cython,ABcDexter/cython,encukou/cython,mcanthony/cython,andreasvc/cython,madjar/cython,bzzzz/cython,da-woods/cython,c-blake/cython,slonik-az/cython,ABcDexter/cython,fabianrost84/cython,hpfem/cython,slonik-az/cython,achernet/cython,achernet/cython,hickford/cython,dahebolangkuan/cython,encukou/cython,c-blake/cython,andreasvc/cython,acrispin/cython,hpfem/cython,acrispin/cython,fperez/cython,achernet/cython,mrGeen/cython,cython/cython,hhsprings/cython,bzzzz/cython,ABcDexter/cython,ABcDexter/cython,rguillebert/CythonCTypesBackend,mcanthony/cython,slonik-az/cython,madjar/cython,andreasvc/cython,fperez/cython,marscher/cython,mcanthony/cython,mrGeen/cython,acrispin/cython,mcanthony/cython,fperez/cython,mrGeen/cython,marscher/cython,hhsprings/cython,madjar/cython,hickford/cython,achernet/cython,c-blake/cython,ABcDexter/cython,fabianrost84/cython,mrGeen/cython,roxyboy/cython,roxyboy/cython,ChristopherHogan/cython,encukou/cython,da-woods/cython,dahebolangkuan/cython,acrispin/cython,fabianrost84/cython,encukou/cython,cython/cython,larsmans/cython