printするときじゃない?
http://216.239.33.100/search?q=cache:WMRP3MTrAU8C:www.hlj.com/~tanoue/Python/doc/ref/customization.html+__str__+__repr__&hl=ja&lr=lang_ja&ie=UTF-8
#新スレで聞けば良いのに。