python - gremlinpython - 以字符串形式返回 id 和标签

Question

我在 Python 3.7.2 上使用 gremlinpython 3.4.1，当获得顶点/边响应时，它提供 <T.id: >对于 id 和 <T.label: 3>对于标签。我如何让它在响应中提供 id 和 label 的字符串值？我的目标是获取输出并生成 JSON

输出:

python3 stackoverflow.py
[{'name': ['USA'], 'parentname': ['USA'], 'shortname': ['US'], <T.id: 1>: 'country-us', 'parentid': ['country-us'], <T.label: 3>: 'Country'}]

代码:

from gremlin_python import statics
from gremlin_python.process.anonymous_traversal import traversal
from gremlin_python.process.graph_traversal import __
from gremlin_python.process.strategies import *
from gremlin_python.driver.driver_remote_connection import DriverRemoteConnection
from gremlin_python.process.traversal import T
from gremlin_python.process.traversal import Order
from gremlin_python.process.traversal import Cardinality
from gremlin_python.process.traversal import Column
from gremlin_python.process.traversal import Direction
from gremlin_python.process.traversal import Operator
from gremlin_python.process.traversal import P
from gremlin_python.process.traversal import Pop
from gremlin_python.process.traversal import Scope
from gremlin_python.process.traversal import Barrier
from gremlin_python.process.traversal import Bindings
from gremlin_python.process.traversal import WithOptions

CLUSTER_ENDPOINT = "removed"
PORT = "8182"
g = traversal().withRemote(DriverRemoteConnection('wss://' + CLUSTER_ENDPOINT + ':' + PORT + '/gremlin','g'))

response = g.V().has('name', 'USA').limit(1000).hasLabel('Country').valueMap(True).toList()
print(response)

顺便说一句 - 我尝试使用 .with_(WithOptions.ids)例如:

response = g.V().has('name', 'USA').limit(1000).hasLabel('Country').valueMap(True).with_(WithOptions.ids).toList()

我收到以下错误:

gremlin_python.driver.protocol.GremlinServerError: 599: {"requestId":"bf74df44-f064-4411-a1cb-78b30f9d2cf6","code":"InternalFailureException","detailedMessage":"Could not locate method: NeptuneGraphTraversal.with([1])"}

Answer 1

此外，对于已经给出的 project() 示例，如果您不能或不想指定属性名称，您可以执行以下操作:

g.V().has('name', 'USA').limit(1000).hasLabel('Country').
  map(union(project('id','label').
              by(id).
              by(label),
            valueMap()).unfold().
      group().
        by(keys).
        by(select(values))) // select(values).unfold() if you only have single values