Jython 2.7.0 (default:9987c746f838, Apr 29 2015, 02:25:11)
[Java HotSpot(TM) 64-Bit Server VM (Oracle Corporation)] on java1.8.0_40
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
# this list is longer than displayed, including all jars in lib/, not just Apache TinkerPop jars
# there is probably a more convenient way of importing jars in Jython though, at the time of writing, no better solution was found.
>>> sys.path.append("/usr/local/apache-gremlin-console-3.4.2-standalone/lib/gremlin-console-3.4.2.jar")
>>> sys.path.append("/usr/local/apache-gremlin-console-3.4.2-standalone/lib/gremlin-core-3.4.2.jar")
>>> sys.path.append("/usr/local/apache-gremlin-console-3.4.2-standalone/lib/gremlin-driver-3.4.2.jar")
>>> sys.path.append("/usr/local/apache-gremlin-console-3.4.2-standalone/lib/gremlin-shaded-3.4.2.jar")
>>> sys.path.append("/usr/local/apache-gremlin-console-3.4.2-standalone/ext/tinkergraph-gremlin/lib/tinkergraph-gremlin-3.4.2.jar")
# import Java classes
>>> from org.apache.tinkerpop.gremlin.tinkergraph.structure import TinkerFactory
>>> from org.apache.tinkerpop.gremlin.process.traversal.dsl.graph import __
>>> from org.apache.tinkerpop.gremlin.process.traversal import *
>>> from org.apache.tinkerpop.gremlin.structure import *
# create the toy "modern" graph and spawn a GraphTraversalSource
>>> graph = TinkerFactory.createModern()
>>> g = graph.traversal()
# The Jython shell does not automatically iterate Iterators like the GremlinConsole
>>> g.V().hasLabel("person").out("knows").out("created")
[GraphStep(vertex,[]), HasStep([~label.eq(person)]), VertexStep(OUT,[knows],vertex), VertexStep(OUT,[created],vertex)]
# toList() will do the iteration and return the results as a list
>>> g.V().hasLabel("person").out("knows").out("created").toList()
[v[5], v[3]]
>>> g.V().repeat(__.out()).times(2).values("name").toList()
[ripple, lop]
# results can be interacted with using Python
>>> g.V().repeat(__.out()).times(2).values("name").toList()[0]
u'ripple'
>>> g.V().repeat(__.out()).times(2).values("name").toList()[0][0:3].upper()
u'RIP'
>>>

# sudo easy_install pip
$ pip install gremlinpython

class GraphTraversalSourceGenerator {

    public static void create(final String graphTraversalSourceFile) {

        final StringBuilder pythonClass = new StringBuilder()

        pythonClass.append("from .traversal import Traversal\n")
        pythonClass.append("from .traversal import TraversalStrategies\n")
        pythonClass.append("from .traversal import Bytecode\n")
        pythonClass.append("from ..driver.remote_connection import RemoteStrategy\n")
        pythonClass.append("from .. import statics\n\n")

//////////////////////////
// GraphTraversalSource //
//////////////////////////
        pythonClass.append(
                """class GraphTraversalSource(object):
  def __init__(self, graph, traversal_strategies, bytecode=None):
    self.graph = graph
    self.traversal_strategies = traversal_strategies
    if bytecode is None:
      bytecode = Bytecode()
    self.bytecode = bytecode
  def __repr__(self):
    return "graphtraversalsource[" + str(self.graph) + "]"
""")
        GraphTraversalSource.getMethods(). // SOURCE STEPS
                findAll { GraphTraversalSource.class.equals(it.returnType) }.
                findAll {
                    !it.name.equals("clone") &&
                            !it.name.equals(TraversalSource.Symbols.withRemote)
                }.
                collect { SymbolHelper.toPython(it.name) }.
                unique().
                sort { a, b -> a <=> b }.
                forEach { method ->
                    pythonClass.append(
                            """  def ${method}(self, *args):
    source = GraphTraversalSource(self.graph, TraversalStrategies(self.traversal_strategies), Bytecode(self.bytecode))
    source.bytecode.add_source("${SymbolHelper.toJava(method)}", *args)
    return source
""")
                }
        pythonClass.append(
                """  def withRemote(self, remote_connection):
    source = GraphTraversalSource(self.graph, TraversalStrategies(self.traversal_strategies), Bytecode(self.bytecode))
    source.traversal_strategies.add_strategies([RemoteStrategy(remote_connection)])
    return source
""")
        GraphTraversalSource.getMethods(). // SPAWN STEPS
                findAll { GraphTraversal.class.equals(it.returnType) }.
                collect { SymbolHelper.toPython(it.name) }.
                unique().
                sort { a, b -> a <=> b }.
                forEach { method ->
                    pythonClass.append(
                            """  def ${method}(self, *args):
    traversal = GraphTraversal(self.graph, self.traversal_strategies, Bytecode(self.bytecode))
    traversal.bytecode.add_step("${SymbolHelper.toJava(method)}", *args)
    return traversal
""")
                }
        pythonClass.append("\n\n")

////////////////////
// GraphTraversal //
////////////////////
        pythonClass.append(
                """class GraphTraversal(Traversal):
  def __init__(self, graph, traversal_strategies, bytecode):
    Traversal.__init__(self, graph, traversal_strategies, bytecode)
  def __getitem__(self, index):
    if isinstance(index, int):
        return self.range(index, index + 1)
    elif isinstance(index, slice):
        return self.range(index.start, index.stop)
    else:
        raise TypeError("Index must be int or slice")
  def __getattr__(self, key):
    return self.values(key)
""")
        GraphTraversal.getMethods().
                findAll { GraphTraversal.class.equals(it.returnType) }.
                findAll { !it.name.equals("clone") }.
                collect { SymbolHelper.toPython(it.name) }.
                unique().
                sort { a, b -> a <=> b }.
                forEach { method ->
                    pythonClass.append(
                            """  def ${method}(self, *args):
    self.bytecode.add_step("${SymbolHelper.toJava(method)}", *args)
    return self
""")
                };
        pythonClass.append("\n\n")

////////////////////////
// AnonymousTraversal //
////////////////////////
        pythonClass.append("class __(object):\n");
        __.class.getMethods().
                findAll { GraphTraversal.class.equals(it.returnType) }.
                findAll { Modifier.isStatic(it.getModifiers()) }.
                collect { SymbolHelper.toPython(it.name) }.
                unique().
                sort { a, b -> a <=> b }.
                forEach { method ->
                    pythonClass.append(
                            """  @staticmethod
  def ${method}(*args):
    return GraphTraversal(None, None, Bytecode()).${method}(*args)
""")
                };
        pythonClass.append("\n\n")
        // add to gremlin.python.statics
        __.class.getMethods().
                findAll { GraphTraversal.class.equals(it.returnType) }.
                findAll { Modifier.isStatic(it.getModifiers()) }.
                findAll { !it.name.equals("__") }.
                collect { SymbolHelper.toPython(it.name) }.
                unique().
                sort { a, b -> a <=> b }.
                forEach {
                    pythonClass.append("def ${it}(*args):\n").append("      return __.${it}(*args)\n\n")
                    pythonClass.append("statics.add_static('${it}', ${it})\n\n")
                }
        pythonClass.append("\n\n")

// save to a python file
        final File file = new File(graphTraversalSourceFile);
        file.delete()
        pythonClass.eachLine { file.append(it + "\n") }
    }
}

class Bytecode(object):
  def __init__(self, bytecode=None):
    self.source_instructions = []
    self.step_instructions = []
    self.bindings = {}
    if bytecode is not None:
      self.source_instructions = list(bytecode.source_instructions)
      self.step_instructions = list(bytecode.step_instructions)

  def add_source(self, source_name, *args):
    newArgs = ()
    for arg in args:
      newArgs = newArgs + (self.__convertArgument(arg),)
    self.source_instructions.append((source_name, newArgs))
    return

  def add_step(self, step_name, *args):
    newArgs = ()
    for arg in args:
      newArgs = newArgs + (self.__convertArgument(arg),)
    self.step_instructions.append((step_name, newArgs))
    return

  def __convertArgument(self,arg):
    if isinstance(arg, Traversal):
      self.bindings.update(arg.bytecode.bindings)
      return arg.bytecode
    elif isinstance(arg, tuple) and 2 == len(arg) and isinstance(arg[0], str):
      self.bindings[arg[0]] = arg[1]
      return Binding(arg[0],arg[1])
    else:
      return arg

[
 ["V", [1]],
 ["repeat", [[
   ["out", ["knows"]]
   ["hasLabel", ["person"]]]]]
 ["times", [2]]
 ["values", ["name"]]
]

$ bin/gremlin-server.sh install org.apache.tinkerpop gremlin-python 3.4.2
$ bin/gremlin-server.sh conf/gremlin-server-modern-py.yaml
[INFO] GremlinServer -
       \,,,/
       (o o)
---oOOo-(3)-oOOo---

[INFO] GremlinServer - Configuring Gremlin Server from conf/gremlin-server-modern-py.yaml
[INFO] MetricManager - Configured Metrics Slf4jReporter configured with interval=180000ms and loggerName=org.apache.tinkerpop.gremlin.server.Settings$Slf4jReporterMetrics
[INFO] GraphManager - Graph [graph] was successfully configured via [conf/tinkergraph-empty.properties].
[INFO] ServerGremlinExecutor - Initialized Gremlin thread pool.  Threads in pool named with pattern gremlin-*
[INFO] ServerGremlinExecutor - Initialized GremlinExecutor and configured ScriptEngines.
[INFO] Logger - 56 attributes loaded from 90 stream(s) in 21ms, 56 saved, 1150 ignored: ["Ant-Version", "Archiver-Version", "Bnd-LastModified", "Boot-Class-Path", "Build-Jdk", "Build-Version", "Built-By", "Bundle-Activator", "Bundle-BuddyPolicy", "Bundle-ClassPath", "Bundle-Description", "Bundle-DocURL", "Bundle-License", "Bundle-ManifestVersion", "Bundle-Name", "Bundle-RequiredExecutionEnvironment", "Bundle-SymbolicName", "Bundle-Vendor", "Bundle-Version", "Can-Redefine-Classes", "Created-By", "DynamicImport-Package", "Eclipse-BuddyPolicy", "Export-Package", "Extension-Name", "Extension-name", "Fragment-Host", "Gremlin-Plugin-Dependencies", "Ignore-Package", "Implementation-Build", "Implementation-Title", "Implementation-URL", "Implementation-Vendor", "Implementation-Vendor-Id", "Implementation-Version", "Import-Package", "Include-Resource", "JCabi-Build", "JCabi-Date", "JCabi-Version", "Main-Class", "Main-class", "Manifest-Version", "Originally-Created-By", "Package", "Private-Package", "Require-Capability", "Specification-Title", "Specification-Vendor", "Specification-Version", "Tool", "Url", "X-Compile-Source-JDK", "X-Compile-Target-JDK", "hash", "version"]
[INFO] ServerGremlinExecutor - A GraphTraversalSource is now bound to [g] with graphtraversalsource[tinkergraph[vertices:0 edges:0], standard]
[INFO] OpLoader - Adding the standard OpProcessor.
[INFO] OpLoader - Adding the session OpProcessor.
[INFO] OpLoader - Adding the traversal OpProcessor.
[INFO] TraversalOpProcessor - Initialized cache for TraversalOpProcessor with size 1000 and expiration time of 600000 ms
[INFO] GremlinServer - Executing start up LifeCycleHook
[INFO] Logger$info - Executed once at startup of Gremlin Server.
[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v3.0+gryo with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0
[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v3.0+gryo-stringd with org.apache.tinkerpop.gremlin.driver.ser.GryoMessageSerializerV3d0
[INFO] AbstractChannelizer - Configured application/vnd.gremlin-v3.0+json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
[INFO] AbstractChannelizer - Configured application/json with org.apache.tinkerpop.gremlin.driver.ser.GraphSONMessageSerializerV3d0
[INFO] GremlinServer$1 - Gremlin Server configured with worker thread pool of 1, gremlin pool of 4 and boss thread pool of 1.
[INFO] GremlinServer$1 - Channel started at port 8182.

Python 2.7.2 (default, Oct 11 2012, 20:14:37)
[GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from gremlin_python import statics
>>> from gremlin_python.structure.graph import Graph
>>> from gremlin_python.driver.driver_remote_connection import DriverRemoteConnection
# loading statics enables __.out() to be out() and P.gt() to be gt()
>>> statics.load_statics(globals())
>>> graph = Graph()
>>> g = graph.traversal().withRemote(DriverRemoteConnection('ws://localhost:8182/gremlin','g'))
# nested traversal with Python slicing and attribute interception extensions
>>> g.V().hasLabel("person").repeat(both()).times(2).name[0:2].toList()
[u'marko', u'marko']
>>> g = g.withComputer()
>>> g.V().hasLabel("person").repeat(both()).times(2).name[0:2].toList()
[u'peter', u'peter']
# a complex, nested multi-line traversal
>>> g.V().match( \
...     as_("a").out("created").as_("b"), \
...     as_("b").in_("created").as_("c"), \
...     as_("a").out("knows").as_("c")). \
...   select("c"). \
...   union(in_("knows"),out("created")). \
...   name.toList()
[u'ripple', u'marko', u'lop']
>>>