routing.py 文件源码

def get_empty_kwargs(self):
        """
        Provides kwargs for instantiating empty copy with empty()

        Use this method to provide custom keyword arguments to the subclass of
        ``Rule`` when calling ``some_rule.empty()``.  Helpful when the subclass
        has custom keyword arguments that are needed at instantiation.

        Must return a ``dict`` that will be provided as kwargs to the new
        instance of ``Rule``, following the initial ``self.rule`` value which
        is always provided as the first, required positional argument.
        """
        defaults = None
        if self.defaults:
            defaults = dict(self.defaults)
        return dict(defaults=defaults, subdomain=self.subdomain,
                    methods=self.methods, build_only=self.build_only,
                    endpoint=self.endpoint, strict_slashes=self.strict_slashes,
                    redirect_to=self.redirect_to, alias=self.alias,
                    host=self.host)