improve memory management example and comments
improve memory management example and comments

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