Hey,
Sorry I am so late in the convo, it took me a minute to get the mailing list
setup (I won’t be sure this is right until after I hit send).
I think you are on to something with this code example. Gremlinpy does this,
but a bit differently. It uses Python’s magic methods to dynamically build a
linked list.
So when you do something like
g = Gremlin()
g.function()
It creates simply adds an gremlinpy.gremlin.Function object to the queue. That
object has the parameters to send once the linked list is converted to a string.
Check out the readme for a few more examples (it can do things like add
pre-defined statements to the chain, nesting Gremlin instances, and manually
binding params) https://github.com/emehrkay/gremlinpy
<https://github.com/emehrkay/gremlinpy>
I think that a very simple linked list build with a fluid interface and few
predefined object types may be a good approach to defining a native way to
represent a Gremlin query.
What do you think?
> On Apr 19, 2016, at 10:19 PM, Marko Rodriguez <[email protected]> wrote:
>
> Hello,
>
> Okay, so I got into a groove. Here is Python->Gremlin-Groovy(String). This is
> pure Python -- nothing Jython going on here.
>
> https://gist.github.com/okram/4705fed038dde673f4c5323416899992
>
> Here it is in action:
>
> # create a traversal source (stupid class name, I know)
>>>> g = PythonStringGraphTraversalSource("g")
>
> # simple warmup
>>>> g.V().has("name","marko")
> g.V().has("name", "marko")
>
> # one has()-method, but varargs parsing is smart
>>>> g.V().has("person","name","marko")
> g.V().has("person", "name", "marko")
>
> # strings and numbers mixed
>>>> g.V().has("person","age",32)
> g.V().has("person", "age", 32)
>
> # nested anonymous traversal
>>>> g.V().where(out("knows"))
> g.V().where(__.out("knows"))
>
> # as() is reserved in Python, so _as() is used.
>>>> g.V()._as("a").out("created")._as("b").where(_as("a").out("knows"))
> g.V().as("a").out("created").as("b").where(__.as("a").out("knows"))
>
> # multi-traversal match()
>>>> g.V().match(_as("a").out("knows")._as("b"), _as("b").out("knows")._as("a"))
> g.V().match(__.as("a").out("knows").as("b"), __.as("b").out("knows").as("a"))
>
> # P-predicates and .name-sugar (attribute access interception)
>>>> g.V().hasLabel("person").has("age",gt(30)).out("created","knows").name
> g.V().hasLabel("person").has("age", P.gt(30)).out("created",
> "knows").values("name")
>
> # smart about boolean conversion
>>>> g.V().valueMap(True,"name","age")
> g.V().valueMap(true, "name", "age")
>
> # lambdas -- ghetto as its not a Python lambda, but a Groovy lambda string
>>>> g.V().map('it.get().value("name")')
> g.V().map(it.get().value("name"))
>
> What other constructs are there? I think thats it… Everything else from here
> is just fat fingering in all the methods. Then, from there you use David
> Brown's GremlinClient (https://github.com/davebshow/gremlinclient) to shuffle
> the string across the network to GremlinServer and get back results. I
> suppose there needs to be some sort of .submit() method ? …. hmmm… wondering
> if .next()/hasNext() iterator methods can be used to submit automagically and
> then it feels JUST like Gremlin-Java.
>
> @Mark: This is what Gremlinpy should do, no?
> @Dylan: Can you find any Gremlin syntax hole I'm missing that isn't solvable
> with the current espoused pattern?
>
> Good, right?
> Marko.
>
> http://markorodriguez.com
>
> On Apr 19, 2016, at 4:51 PM, Marko Rodriguez <[email protected]> wrote:
>
>> Hi,
>>
>> Done for the night. Here is PythonStringGraphTraversal.
>>
>> https://gist.github.com/okram/4705fed038dde673f4c5323416899992
>>
>> ??? Cool?
>>
>> Marko.
>>
>> http://markorodriguez.com
>>
>> On Apr 19, 2016, at 4:28 PM, Marko Rodriguez <[email protected]> wrote:
>>
>>> Hi,
>>>
>>> So I "learned" Python and am able to do a Python class wrapper around
>>> GraphTraversal.
>>>
>>> https://gist.github.com/okram/1a0c5f6b65a4b70c558537e5eeaad429
>>>
>>> Its crazy, it "just works" -- with __ static methods and all.
>>>
>>> The reason I wanted to create a wrapper is because I want to use
>>> Python-specific language constructs and not only Gremlin-Java. What those
>>> specific language constructs are, I don't know as I don't know Python :).
>>> Moreover, this shell of a wrapper will be used for the JNI and String
>>> construction models. Right?
>>>
>>>>>> g = PythonGraphTraversalSource(graph)
>>>>>> g
>>> graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
>>>>>> g.V()
>>> [GraphStep(vertex,[])]
>>>>>> g.V().toList()
>>> [v[1], v[2], v[3], v[4], v[5], v[6]]
>>>>>> g.V().where(__.out("created")).values("name").toList()
>>> [marko, josh, peter]
>>>>>>
>>>
>>> Even valueMap() which takes var args of different types works.
>>>
>>>>>> g.V().valueMap()
>>> [GraphStep(vertex,[]), PropertyMapStep(value)]
>>>>>> g.V().valueMap().toList()
>>> [{name=[marko], age=[29]}, {name=[vadas], age=[27]}, {name=[lop],
>>> lang=[java]}, {name=[josh], age=[32]}, {name=[ripple], lang=[java]},
>>> {name=[peter], age=[35]}]
>>>>>> g.V().valueMap("name").toList()
>>> [{name=[marko]}, {name=[vadas]}, {name=[lop]}, {name=[josh]},
>>> {name=[ripple]}, {name=[peter]}]
>>>>>> g.V().valueMap(True,"name").toList()
>>> [{label=person, name=[marko], id=1}, {label=person, name=[vadas], id=2},
>>> {label=software, name=[lop], id=3}, {label=person, name=[josh], id=4},
>>> {label=software, name=[ripple], id=5}, {label=person, name=[peter], id=6}]
>>>>>>
>>>
>>> Easy peasy lemon squeezy or is there something fundamental I'm missing?
>>>
>>> Marko.
>>>
>>> http://markorodriguez.com
>>>
>>> On Apr 19, 2016, at 2:58 PM, Marko Rodriguez <[email protected]> wrote:
>>>
>>>> Hi,
>>>>
>>>> So I downloaded and installed Jython 2.7.0.
>>>>
>>>> This how easy it was to get Gremlin working in Jython.
>>>>
>>>> import sys
>>>> sys.path.append("/Users/marko/software/tinkerpop/tinkerpop3/gremlin-console/target/apache-gremlin-console-3.2.1-SNAPSHOT-standalone/lib/commons-codec-1.9.jar")
>>>> sys.path.append("/Users/marko/software/tinkerpop/tinkerpop3/gremlin-console/target/apache-gremlin-console-3.2.1-SNAPSHOT-standalone/lib/commons-configuration-1.10.jar")
>>>> … lots of jars to add
>>>> sys.path.append("/Users/marko/software/tinkerpop/tinkerpop3/gremlin-console/target/apache-gremlin-console-3.2.1-SNAPSHOT-standalone/ext/tinkergraph-gremlin/lib/tinkergraph-gremlin-3.2.1-SNAPSHOT.jar")
>>>>
>>>> from org.apache.tinkerpop.gremlin.tinkergraph.structure import
>>>> TinkerFactory
>>>> graph = TinkerFactory.createModern()
>>>> g = graph.traversal()
>>>> g
>>>> g.V().hasLabel("person").out("knows").out("created")
>>>> g.V().hasLabel("person").out("knows").out("created").toList()
>>>>
>>>> Then, the output looks like this:
>>>>
>>>>>>> from org.apache.tinkerpop.gremlin.tinkergraph.structure import
>>>>>>> TinkerFactory
>>>>>>> graph = TinkerFactory.createModern()
>>>>>>> g = graph.traversal()
>>>>>>> g
>>>> graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
>>>>>>> g.V().hasLabel("person").out("knows").out("created")
>>>> [GraphStep(vertex,[]), HasStep([~label.eq(person)]),
>>>> VertexStep(OUT,[knows],vertex), VertexStep(OUT,[created],vertex)]
>>>>>>> g.V().hasLabel("person").out("knows").out("created").toList()
>>>> [v[5], v[3]]
>>>>
>>>> Note that, of course, Jython's command line doesn't auto-iterate
>>>> traversals. Besides that -- sheez, that was simple.
>>>>
>>>> The trick now is to use Jython idioms to make Gremlin-Jython be
>>>> comfortable to Python users…
>>>>
>>>> Marko.
>>>>
>>>> http://markorodriguez.com
>>>>
>>>> On Apr 19, 2016, at 11:43 AM, Marko Rodriguez <[email protected]> wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> So I just pushed:
>>>>>
>>>>> https://git1-us-west.apache.org/repos/asf?p=incubator-tinkerpop.git;a=commitdiff;h=0beae616
>>>>>
>>>>> This should help provide the scaffolding for the tutorial. Given that I
>>>>> know nothing about Python, I think my contributions start to fall off
>>>>> significantly here. :) … Well, I can help and write more text, I just
>>>>> don't know how to use Jython, Python idioms, Gremlinpy, etc…..
>>>>>
>>>>> @Mark/Dylan: If you want to build the tutorial and look at it, you simple
>>>>> do:
>>>>>
>>>>> $ bin/process-docs.sh --dryRun
>>>>>
>>>>> And then for me, the URI to which I point my browser for the index.html
>>>>> on my local computer is:
>>>>>
>>>>>
>>>>> file:///Users/marko/software/tinkerpop/tinkerpop3/target/docs/htmlsingle/tutorials/gremlin-language-variants/index.html
>>>>>
>>>>> Marko.
>>>>>
>>>>> http://markorodriguez.com
>>>>>
>>>>> On Apr 19, 2016, at 9:16 AM, Marko Rodriguez <[email protected]> wrote:
>>>>>
>>>>>> Hello (NOTE: I dropped gremlin-users@),
>>>>>>
>>>>>> Thank you Stephen. Its crazy how simple that is :D.
>>>>>> https://twitter.com/apachetinkerpop/status/722432843360546816
>>>>>>
>>>>>> So Mark, now your fork's TINKERPOP-1232/ branch and
>>>>>> https://github.com/apache/incubator-tinkerpop/tree/TINKERPOP-1232 exist
>>>>>> and we can keep them sync'd accordingly as we develop this tutorial.
>>>>>> When we feel that the tutorial is ready for primetime, we will issue a
>>>>>> PR to have it merged into tp31/ (and thus, up merged to master/).
>>>>>>
>>>>>> Where do we go from here? I think this is a good opportunity to work
>>>>>> both on Gremlinpy and the tutorial. Can we make Gremlinpy as true to the
>>>>>> spirit of "host language embedding" as possible? In doing so, can we
>>>>>> explain how we did it so other language providers can learn the best
>>>>>> practices?
>>>>>>
>>>>>> In the tutorial we have 3 models we want to promote:
>>>>>>
>>>>>> 1. Jython
>>>>>> 2. Python JINI
>>>>>> 3. Python String
>>>>>>
>>>>>> (1) is easy to knock off. In fact, we should ask Michael Pollmeier for
>>>>>> advice here given his work on Gremlin-Scala. (2) -- ?? do you know how
>>>>>> do this? If so, it should be only fairly more difficult than (1).
>>>>>> Finally, (3) is the big win and where I think most of the work both in
>>>>>> the tutorial and in Gremlinpy will happen.
>>>>>>
>>>>>> How do you propose we proceed?
>>>>>>
>>>>>> Thank you,
>>>>>> Marko.
>>>>>>
>>>>>> http://markorodriguez.com
>>>>>>
>>>>>> On Apr 19, 2016, at 8:24 AM, Stephen Mallette <[email protected]>
>>>>>> wrote:
>>>>>>
>>>>>>> ok - done:
>>>>>>> https://github.com/apache/incubator-tinkerpop/tree/TINKERPOP-1232
>>>>>>>
>>>>>>> On Tue, Apr 19, 2016 at 9:41 AM, Marko Rodriguez <[email protected]>
>>>>>>> wrote:
>>>>>>> Hello,
>>>>>>>
>>>>>>> *** Mark, if you are not on dev@tinkerpop, I would recommend joining
>>>>>>> that as I will drop gremlin-users@ from communication on this ticket
>>>>>>> from here on out. ***
>>>>>>>
>>>>>>> @Stephen: Mark forked the TinkerPop repository to his GitHub account. I
>>>>>>> believe he gave you access as well as me.
>>>>>>>
>>>>>>> Can you create a new stub tutorial for Mark+Dylan+me? (Moving forward,
>>>>>>> I will learn how to do it from your one commit).
>>>>>>>
>>>>>>> gremlin-language-variants/
>>>>>>>
>>>>>>> After that Mark+Dylan+me will go to town on:
>>>>>>> https://issues.apache.org/jira/browse/TINKERPOP-1232
>>>>>>>
>>>>>>> Thank you,
>>>>>>> Marko.
>>>>>>>
>>>>>>> http://markorodriguez.com
>>>>>>>
>>>>>>> Begin forwarded message:
>>>>>>>
>>>>>>>> From: Mark Henderson <[email protected]>
>>>>>>>> Subject: emehrkay added you to incubator-tinkerpop
>>>>>>>> Date: April 15, 2016 10:04:54 AM MDT
>>>>>>>> To: "Marko A. Rodriguez" <[email protected]>
>>>>>>>>
>>>>>>>> You can now push to this repository.
>>>>>>>>
>>>>>>>> ---
>>>>>>>> View it on GitHub:
>>>>>>>> https://github.com/emehrkay/incubator-tinkerpop
>>>>>>>
>>>>>>>
>>>>>>> --
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>>>>>>> https://groups.google.com/d/msgid/gremlin-users/18A7D2FD-B9B1-4DC9-980B-66A6A8F9C7C8%40gmail.com.
>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>>
>>>>>>>
>>>>>>> --
>>>>>>> You received this message because you are subscribed to the Google
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>>>>>>> For more options, visit https://groups.google.com/d/optout.
>>>>>>
>>>>>
>>>>
>>>
>>
>
