Neo4j 如何检查graph_db.get_indexed_节点的结果是否为空？

如何测试是否已找到/未找到节点

NODE = graph_db.get_indexed_node("index", "ID", "myID")
if (NODE == None):
    print "None found"
    exit()

不幸的是，结果是：

Traceback (most recent call last):
  File "foo.py", line 275, in foobar
    if (NODE == None):
  File "...\py2neo\neo4j.py", line 1499, in __eq__
    return _Entity.__eq__(self, other)
  File "...\py2neo\neo4j.py", line 324, in __eq__
    return self._resource == other._resource
AttributeError: 'NoneType' object has no attribute '_resource'

因为类“py2neo.neo4j.Node”不能与“None”进行比较

如何检查graph_db.get_indexed_节点的结果是否为空？

---

谢谢

我找到了一个解决办法：

assert ( type(NODE) != type(None) )

---

哎呀！；-）

正确答案是使用：

if node is None:
    ...

或

与常量比较时，始终使用

is

而不是

=

assert Node is not None