human
Solve the following python programming problem given the following code:
@ require_cluster (1, require_container_agent = True) 
def test_create_container_with_dataset(self, cluster) : 
    '
        Create a container with an attached dataset, write some data,
        shut it down, create a new container with same dataset, make sure
        the data is still there.
        ' 
    data = { 
        'the data' : 'sample written data', 
} 
    post_data = { 
        'data' : dumps (data), 
} 
    node = cluster.nodes [0] 
    container_name = random_name (self) 
    creating_dataset = create_dataset (self, cluster) 
    self.dataset_id = None 
    def create_container(dataset) : 
        self.dataset_id = unicode (dataset.dataset_id) 
        d = create_python_container (self, cluster, { 
            'name' : container_name, 
            'ports' : [{ 
                'internal' : 8080, 
                'external' : 8080, 
}], 
            'node_uuid' : node.uuid, 
            'volumes' : [{ 
                'dataset_id' : self.dataset_id, 
                'mountpoint' : '/data', 
}], 
}, SCRIPTS.child (b'datahttp.py'), additional_arguments = ['/data'], cleanup = False) 
        return d 
creating_dataset.addCallback (<MASK>) 
    creating_dataset.addCallback ((lambda _ : post_http_server (self, node.public_address, 8080, post_data))) 
    creating_dataset.addCallback ((lambda _ : assert_http_server (self, node.public_address, 8080, expected_response = post_data ['data']))) 
    creating_dataset.addCallback ((lambda _ : cluster.remove_container (container_name))) 
    def create_second_container(_) : 
        d = create_python_container (self, cluster, { 
            'ports' : [{ 
                'internal' : 8080, 
                'external' : 8081, 
}], 
            'node_uuid' : node.uuid, 
            'volumes' : [{ 
                'dataset_id' : self.dataset_id, 
                'mountpoint' : '/data', 
}], 
}, SCRIPTS.child (b'datahttp.py'), additional_arguments = ['/data']) 
        return d 
creating_dataset.addCallback (create_second_container) 
   ...
    
    Given the code above, what is a proper replacement for <MASK>? Choose among: node, container_name, data, post_data, creating_dataset, cluster, self, create_second_container
assistant
#Here is a proper replacement for <MASK>.
def create_container(