docs: def from_gamertag(cls, gamertag):
          '''
          Instantiates an instance of ``GamerProfile`` from
          a gamertag
  
          :param gamertag: Gamertag to look up
  
          :raises: :class:`~xbox.exceptions.GamertagNotFound`
  
          :returns: :class:`~xbox.GamerProfile` instance
          '''
          url = 'https://profile.xboxlive.com/users/gt(%s)/profile/settings' % gamertag
          try:
              return cls._fetch(url)
          except GamertagNotFound:
              raise GamertagNotFound('No such user: %s' % gamertag)