Python: "yield from "产生语法错误

我正在使用 Gaston Frequent Subgraph Mining implementation by Njissen在 Ubuntu 16.04 上，并在 Python 3.6.5 和 2.7.15rc1 上都试过了。执行程序时，我得到一个

Traceback (most recent call last): 
  File "/home/elias/.local/bin/gaston", line 11, in <module> 
    load_entry_point('gaston-py==0.1', 'console_scripts', 'gaston')() 
  File "/home/elias/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 484, in load_entry_point 
    return get_distribution(dist).load_entry_point(group, name) 
  File "/home/elias/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2725, in load_entry_point 
    return ep.load() 
  File "/home/elias/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2343, in load 
    return self.resolve() 
  File "/home/elias/.local/lib/python2.7/site-packages/pkg_resources/__init__.py", line 2349, in resolve 
    module = __import__(self.module_name, fromlist=['__name__'], level=0) 
  File "/home/elias/.local/lib/python2.7/site-packages/gaston_py/gaston.py", line 5, in <module> 
    import gaston_py.factory as factory 
  File "/home/elias/.local/lib/python2.7/site-packages/gaston_py/factory.py", line 7, in <module> 
    import gaston_py.embedding as embedding 
  File "/home/elias/.local/lib/python2.7/site-packages/gaston_py/embedding.py", line 70 
    yield from _create_embedding_list(graph, visited, neighbor_id) 
             ^ 
SyntaxError: invalid syntax 

在

yield from _create_embedding_list(graph, visited, neighbor_id) 

产生错误的代码块:

def _create_embedding_list(graph, visited, node_id): 
    for edge_label, neighbor_label, neighbor_id in sorted(_neighbor_labels(graph, visited, node_id)): 
        if (node_id, neighbor_id) not in visited: 
            visited.add((node_id, neighbor_id)) 
            visited.add((neighbor_id, node_id)) # if graph is undirected 
 
            yield node_id, (edge_label, neighbor_label) 
            yield from _create_embedding_list(graph, visited, neighbor_id) 

由于这是官方实现，我怀疑存在不兼容性或类似情况。如何运行此代码？感谢您的任何建议!

请您参考如下方法:

如回溯所示，您正在 Python 2.7 中运行此代码。但是 yield from 是在 Python 3 3 中引入的，早期版本不支持。