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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 is_following(self, login):
 """Check if the authenticated user is following login. :param str login: (required), login of the user to check if the authenticated user is checking :returns: bool """

        json = False
        if login:
            url = self._build_url('user', 'following', login)
            json = self._boolean(self._get(url), 204, 404)
        return json