Google App engine Url Mapping using WSGIAppl and regex grouping 需要帮助

Question

以谷歌文档为例

class BrowseHandler(webapp.RequestHandler):

>     def get(self, category, product_id):
>         # Display product with given ID in the given category.
> 
> 
> # Map URLs like /browse/(category)/(product_id) to
> BrowseHandler. application =
> webapp.WSGIApplication([(r'/browse/(.*)/(.*)',
> BrowseHandler)
>                                      ],
>                                      debug=True)
> 
> def main():
>     run_wsgi_app(application)
> 
> if __name__ == '__main__':
>     main()

如何更改 regx 分组以便产品 id 是可选的

即在上面的当前示例中，URL http://yourdomain.com/category 将被发送到浏览处理程序，您必须在类别之后添加产品 ID 或至少 /

即

http://yourdomain.com/category/

r'/browse/(.)/(.)'

有什么想法吗？

Answer 1

您可以使用映射到同一个处理程序的两个正则表达式：

class BrowseHandler(webapp.RequestHandler):

    def get(self, category, product_id=None):
        # Display product with given ID in the given category.


# Map URLs like /browse/(category)/(product_id) to
BrowseHandler. application =
webapp.WSGIApplication([(r'/browse/(.*)/(.*)', BrowseHandler),
                        (r'/browse/(.*)', BrowseHandler),
                       ], debug=True)

def main():
    run_wsgi_app(application)

if __name__ == '__main__':
    main()

Answer 2

尝试添加“？”在你的正则表达式结束之前：

r'/browse/(.)/(.)?'