def portfolio(self, username):
        """
        Retrieve a single user’s portfolio link.

        :param username [string]: The user’s username. Required.
        :return: [Link]: The Unsplash Link.
        """
        url = "/users/{username}/portfolio".format(username=username)
        result = self._get(url)
        return LinkModel.parse(result)
Retrieve a single user’s portfolio link.

        :param username [string]: The user’s username. Required.
        :return: [Link]: The Unsplash Link.