Python client for an open-source graph database Cayley
Project description
pyley
Python client for an open-source graph database Cayley https://github.com/google/cayley.
Cayley is an open-source graph inspired by the graph database behind Freebase and Google’s Knowledge Graph. Its goal is to be a part of the developer’s toolbox where Linked Data and graph-shaped data (semantic webs, social networks, etc) in general are concerned.
Install via pip
You can install pyley using:
$ pip install pyley
Sample
Import pyley:
import pyley # Create cayley client client = CayleyClient() # this creates client with default parameters `http://localhost:64210/api/v1/query/gizmo` #or specify `url` and `version` parameters client = CayleyClient("http://localhost:64210", "v1") g = GraphObject() # Query all vertices in the graph, limit to the first 5 vertices found. g.Vertex().GetLimit(5) # Start with only one vertex, the literal name "Humphrey Bogart", and retrieve all of them. query = g.Vertex("Humphrey Bogart").All(); response = client.Send(query) # response.result contains JSON data and response.r contains raw response print response.result # `g` and `V` are synonyms for `graph` and `Vertex` respectively, as they are quite common. query = g.V("Humphrey Bogart").All() response = client.Send(query) # "Humphrey Bogart" is a name, but not an entity. Let's find the entities with this name in our dataset. # Follow links that are pointing In to our "Humphrey Bogart" node with the predicate "name". query = g.V("Humphrey Bogart").In("name").All() response = client.Send(query) # Notice that "name" is a generic predicate in our dataset. # Starting with a movie gives a similar effect. query = g.V("Casablanca").In("name").All() response = client.Send(query) # Relatedly, we can ask the reverse; all ids with the name "Casablanca" query = g.V().Has("name", "Casablanca").All() response = client.Send(query) # Let's get the list of actors in the film query = g.V().Has("name", "Casablanca") \ .Out("/film/film/starring") \ .Out("/film/performance/actor") \ .Out("name") \ .All() response = client.Send(query) # But this is starting to get long. Let's use a morphism -- a pre-defined path stored in a variable -- as our linkage film_to_actor = g.Morphism().Out("/film/film/starring").Out("/film/performance/actor") query = g.V() \ .Has("name", "Casablanca") \ .Follow(film_to_actor) \ .Out("name") \ .All() response = client.Send(query) # Add data programatically to the JSON result list. Can be any JSON type. query = g.Emit({'name': "John Doe", 'age': 41, 'isActor': True}) response = client.Send(query)
Bugs
If you encounter a bug, performance issue, or malfunction, please add an Issues with steps on how to reproduce the problem.
TODO
Improve Gizmo implementation (Basic steps implemented at the moment)
Add more tests
Add more documentation
Open Source Projects in Use
requests by @kennethreitz
License
@ziλasal & @abdullahselek
Code and documentation are available according to the MIT License (see LICENSE).
Project details
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