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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 get_resource_links(self, item):
 """Hook for adding links to a resource object."""

        if self.opts.self_url:
            ret = self.dict_class()
            kwargs = resolve_params(item, self.opts.self_url_kwargs or {})
            ret['self'] = self.generate_url(self.opts.self_url, **kwargs)
            return ret
        return None