Python 中没有 TinkerGraph。在 gremlin-python 中,您只能在服务器上远程获得对图形的引用,这可能是 TinkerGraph 或其他东西。如果要以这种方式加载数据,则必须通过Client
实例将该命令作为脚本发出:
client = Client('ws://localhost:45940/gremlin', 'g')
client.submit("graph.io(graphml()).readGraph('air-routes.graphml');[]").all().result()
该脚本中的“graph”是Graph
服务器上已经存在的实例(并且可能是空的)。如果您使用 Gremlin Server,您可能会考虑将加载作为Gremlin Server 启动的一部分单独进行,然后仅使用 gremlin-python 来查询该数据。在这个例子中这可能是最好的,因为数据只会在服务器启动时出现。
请注意,在 3.4.0 中,我们直接引入了io()
将成为 gremlin-python 一部分的步骤,此时您将能够直接执行以下操作:
g.io('air-routes.xml').read()
在本机 python 中,它可以正常工作(同样,Graph
必须远程定义实例),尽管文件必须可由服务器读取。
这是我在 Python shell 中提交脚本的工作示例,首先出现龙卷风错误,然后没有:
$ env/bin/python
Python 3.4.3 (default, Nov 28 2017, 16:41:13)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from gremlin_python.driver.client import Client
>>> client = Client('ws://localhost:8182/gremlin', 'g')
>>> client.submit("g.V()").all().result()
Traceback (most recent call last):
File "/home/smallette/git/apache/incubator-tinkerpop/gremlin-python/target/python3/gremlin_python/driver/client.py", line 51, in __init__
from gremlin_python.driver.tornado.transport import (
File "/home/smallette/git/apache/incubator-tinkerpop/gremlin-python/target/python3/gremlin_python/driver/tornado/transport.py", line 19, in <module>
from tornado import ioloop, websocket
ImportError: No module named 'tornado'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/smallette/git/apache/incubator-tinkerpop/gremlin-python/target/python3/gremlin_python/driver/driver_remote_connection.py", line 45, in __init__
password=password)
File "/home/smallette/git/apache/incubator-tinkerpop/gremlin-python/target/python3/gremlin_python/driver/client.py", line 54, in __init__
raise Exception("Please install Tornado or pass"
Exception: Please install Tornado or passcustom transport factory
>>> exit
Use exit() or Ctrl-D (i.e. EOF) to exit
>>> exit()
$ env/bin/pip install tornado
Collecting tornado
Collecting backports-abc>=0.4 (from tornado)
Using cached https://files.pythonhosted.org/packages/7d/56/6f3ac1b816d0cd8994e83d0c4e55bc64567532f7dc543378bd87f81cebc7/backports_abc-0.5-py2.py3-none-any.whl
Installing collected packages: backports-abc, tornado
Successfully installed backports-abc-0.5 tornado-5.1.1
smallette@ubuntu:~/git/apache/incubator-tinkerpop/gremlin-python/target/python3$ env/bin/python
Python 3.4.3 (default, Nov 28 2017, 16:41:13)
[GCC 4.8.4] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from gremlin_python import statics
>>> client = Client('ws://localhost:8182/gremlin', 'g')
>>> client.submit("g.V()").all().result()
[v[0]]