查询中的py2neo - UnicodeEncodeError

Question

我在使用py2neo查询neo4j时遇到错误，似乎无法解决它。我的代码：

data, metadata = cypher.execute(self._db, 'START s=node:pages(title="%s") MATCH (s)-[r]->(n) RETURN n.title' % topic)

和错误

  File "/usr/local/lib/python2.7/dist-packages/py2neo/cypher.py", line 50, in execute
    results = query.execute(**params or {})
  File "/usr/local/lib/python2.7/dist-packages/py2neo/neo4j.py", line 1011, in execute
    return CypherResults(self._execute(**params))
  File "/usr/local/lib/python2.7/dist-packages/py2neo/neo4j.py", line 1053, in __init__
    self._data = [record(*_hydrated(row)) for row in content["data"]]
  File "/usr/local/lib/python2.7/dist-packages/py2neo/neo4j.py", line 178, in _hydrated
    return type(data)([_hydrated(datum) for datum in data])
  File "/usr/local/lib/python2.7/dist-packages/py2neo/neo4j.py", line 177, in _hydrated
    elif is_collection(data):
  File "/usr/local/lib/python2.7/dist-packages/py2neo/util.py", line 134, in is_collection
    hasattr(None, obj)
None: 'ascii' codec can't encode character u'\xeb' in position 5: ordinal not in range(128)

有什么线索吗？

谢谢

Answer 1

这看起来可能是由查询结果数据中意外的字节序列或字符集触发的py2neo中的错误。您是否能够详细说明您希望它返回的数据，以及您是否使用UTF-8？

Answer 2

我会说在topic中有一个非ASCII字节，这可能是导致它的原因。如果你有这个问题，你可以试着

data, metadata = cypher.execute(self._db, u'START s=node:pages(title="%s") MATCH (s)-[r]->(n) RETURN n.title' % topic)

而这实际上可能会解决你的问题。(我只想对此进行评论，但我不能，对不起。)如果这不起作用，请尝试：

(u'STATE s=node:...' ... % topic.decode('utf-8')).encode('utf-8')

这样就行了。