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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def reverse_url(self, name: str, *args: Any) -> str: """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. """

        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)