python 中的 web 框架下的一些命名问题？

import web

urls = ('/','index')

app = web.application(urls,globals())

class index:
    def GET(self):
        greeting = 'hello word'
        return greeting

if __name__ == "__main__":
    app.run()

class homepage:
    def GET(self):
        greeting = 'hello word'
        return greeting