fix warning in newer IPython versions
fix warning in newer IPython versions

mcanthony/cython,scoder/cython,ChristopherHogan/cython,hickford/cython,c-blake/cython,mcanthony/cython,fabianrost84/cython,dahebolangkuan/cython,ChristopherHogan/cython,c-blake/cython,mcanthony/cython,mrGeen/cython,hhsprings/cython,acrispin/cython,da-woods/cython,fperez/cython,mrGeen/cython,cython/cython,dahebolangkuan/cython,da-woods/cython,scoder/cython,fabianrost84/cython,JelleZijlstra/cython,hhsprings/cython,scoder/cython,roxyboy/cython,JelleZijlstra/cython,hickford/cython,JelleZijlstra/cython,mcanthony/cython,dahebolangkuan/cython,acrispin/cython,mrGeen/cython,da-woods/cython,fperez/cython,hickford/cython,c-blake/cython,cython/cython,roxyboy/cython,cython/cython,JelleZijlstra/cython,dahebolangkuan/cython,da-woods/cython,acrispin/cython,fabianrost84/cython,scoder/cython,mrGeen/cython,fperez/cython,roxyboy/cython,acrispin/cython,cython/cython,c-blake/cython,hhsprings/cython,mcanthony/cython,roxyboy/cython,roxyboy/cython,fabianrost84/cython,hickford/cython,hhsprings/cython,ChristopherHogan/cython,hhsprings/cython,fperez/cython,JelleZijlstra/cython,hickford/cython,mrGeen/cython,fperez/cython,dahebolangkuan/cython,acrispin/cython,fabianrost84/cython,c-blake/cython