'Get an individual size (flavor).
:keyword size_id: Size\'s ID
:type    size_id: ``str``
:return: Size
:rtype: :class:`NodeSize`'

def ex_get_size(self, size_id):

    action = self._get_project_action(('flavor/%s' % size_id))
    response = self.connection.request(action)
    return self._to_size(response.object)
