'Returns a URL path for handler named ``name``
The handler must be added to the application as a named `URLSpec`.
Args will be substituted for capturing groups in the `URLSpec` regex.
They will be converted to strings if necessary, encoded as utf8,
and url-escaped.'

def reverse_url(self, name, *args):

    reversed_url = self.default_router.reverse_url(name, *args)
    if (reversed_url is not None):
        return reversed_url
    raise KeyError(('%s    not    found    in    named    urls' % name))
