rdflib | Python library for working with RDF | JSON Processing library
kandi X-RAY | rdflib Summary
kandi X-RAY | rdflib Summary
RDFLib is a Python library for working with RDF, a simple yet powerful language for representing information.
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Top functions reviewed by kandi - BETA
- Generate a VOID from a graph
- Create a new Literal instance
- Adds a triple to the graph
- Create a new URIRef
- Parse and return a Graph object
- Create input source based on location
- Convert a URI to a URI
- Create an input source
- Example example
- Serialize the graph to a file
- Start a new element
- Returns the value for the given subject and object
- Write the graph to the given stream
- Default cast function
- Process a property element
- Return a relational expression
- Convert a csv file into an instance
- Evaluate a graph
- Serialize the namespace to a stream
- EndElement XML element
- Make an option parser
- Handle addition of an expression
- Serialize the graph into bytes
- Convert rdf to DOT format
- Returns the choices for the given triple
- Convert an RDF graph to a dot representation
- Perform a query endpoint
rdflib Key Features
rdflib Examples and Code Snippets
Lines of Code : 41License : Non-SPDX (NOASSERTION)
Copylibrary(magrittr)
library(rdflib)
system.file("extdata/dc.rdf", package="redland") %>%
rdf_parse() %>%
rdf_serialize("test.nquads", "nquads")
sparql <-
'PREFIX dc:
SELECT ?a ?c
WHERE { ?a dc:creator ?c . }'
system.file("extdata/ out <- tempfile()
rdf_serialize(x, out, "jsonld")
rdf_parse(out, format = "jsonld")
#> Total of 1 triples, stored in hashes
#> -------------------------------
#> {
#> "@id": "http://www.dajobe.org/",
#> "http://purl.org/dc/eleme # install.packages("devtools")
devtools::install_github("ropensci/rdflib")
import pandas as pd
from rdflib import Graph, URIRef, Namespace
d = {
"source": pd.Series(["Edwin", "Reema", "Ron", "Tomorrow"]),
"target": pd.Series(["football", "karate", "singer", "holiday"]),
"edge": pd.Series(["plays", "namespaces = dict([
('xml', rdflib.term.URIRef('http://www.w3.org/XML/1998/namespace')),
('foo', rdflib.term.URIRef('http://example.org/scheme#')),
])
...
g.subject_objects(namespaces['foo'].bar)
for varittl = """
PREFIX sh:
sh:pattern "^\s|\d{VALUE}\D" .
"""
g = Graph()
g.add((
URIRef("a:"),
URIRef("http://www.w3.org/ns/shacl#pattern"),
Literal("^\s|\d{VALUE}\D")
))
g2 = Graph().parse(daimport rdflib
from rdflib.plugins import sparql
g = rdflib.Graph()
g.parse("family.ttl")
q = sparql.prepareQuery(
"""SELECT ?child ?sister WHERE {
?child fam:hasParent ?parent .
?parent fam:hasSister ?sist'''
""
'''
'''
""
'''
'''
''
'''
httpretty.set_default_thread_timeout(60)
# enable HTTPretty so that it will monkey patch the socket module
httpretty.enable(verbose=True, allow_net_connect=False)
yield lambda uri, initial_data, **kwargs: Endpoint(uri, inifrom rdflib import Graph, URIRef
uris = [URIRef('http://purl.obolibrary.org/obo/RO_0002219'), URIRef('http://purl.obolibrary.org/obo/RO_0002551')]
for uri in uris:
query = """
SELECT ?label WHERE {
<"""+str(uri)+"""> rdCommunity Discussions
Trending Discussions on rdflib
QUESTION
I have been facing a great deal of difficulty trying to write a python code that will return the list of movies by the director called Francis Ford Coppola. Below is a good that I have so far your assistance will be greatly appreciated. I have also added a picture of the list movie, I hope it helps.
...ANSWER
Answered 2021-Apr-24 at 07:39Try using an RDFlib Store to connect to wrap the DBpedia SPARQL endpoint like this: https://github.com/RDFLib/rdflib/blob/master/examples/sparqlstore_example.py#L13
QUESTION
I'm trying to run SPARQL queries on turtle files using python, but my sparql returns all the entries, how can I return the entry with name="Idham Al-Taif Mahmoud"?
turtle file:
...ANSWER
Answered 2021-Apr-18 at 18:04I think your issue is with the methods. Here is a link with a nice example of what you want to do.
The following script works for me:
QUESTION
I need to retrieve triples for entities which have a transitive relationship, but I only want as subjects the entity at the end of the transitivity chain.
For the following example:
...ANSWER
Answered 2021-Apr-16 at 02:12For me, it always helps to try and formulate the query in words, first. What you want is to say: "only give me those ancestors that themselves do not have any further ancestors".
To formulate this in SPARQL, use a FILTER NOT EXISTS constraint, something like this:
QUESTION
I have a problem with updating packages in conda. The list of my installed packages is:
...ANSWER
Answered 2021-Apr-14 at 20:26Channel pypi means that the package was installed with pip. You may need to upgrade it with pip as well
QUESTION
In the following minimal test case:
...ANSWER
Answered 2021-Feb-09 at 07:01Your base declaration also needs the final has or slash in it.
So try g = Graph(base="http://test.com/ns#") and everything will work fine
OR
Try without any base in this case.
Either will give you valid results. Yes there is something odd going on deep inside RDFlib with the base, but only when it's not ended with # or /.
By the way, your triples are a bit invalid: you can't use rdf:type with a range value of a literal, it has to be an rdf:Class instance.
QUESTION
I am having difficulty in printing the SKOS broader and narrower concepts against my URIRef (i.e. the output of the SPAQRL query). I want to print the Broader and Narrowers concepts against the captured URI REF (i.e. Biomass). The file which i am parsing does not contains the Broader and Narrowers concepts. I dont know whether i need to manually add them in file before i run queries on them.
I have already seen the similar questions like skos broader and narrow inverse not working but couldnt find the solution.
...ANSWER
Answered 2021-Jan-19 at 18:24If you're just struggling with the query, then I think you're overcomplicating it. This should work
QUESTION
I have the following example instance of the Brick.ttl buildings ontology
ANSWER
Answered 2020-Dec-24 at 08:27In the Manchester syntax, instead of
QUESTION
After digging I cannot manage to understand what happened with our server. I got this error when loading the web.
It was working and anyone touch anything. I have changed the ownership of the application.txt because this error. [Wed Dec 16 04:38:12.059839 2020] [wsgi:error] [pid 12343:tid 140072894818048] [remote xx.xx.xxx.xx:xxxxx] ValueError: Unable to configure handler 'file': [Errno 13] Permission denied: '/opt/yhmp-app/YHMP/eamena/logs/application.txt'
After this it is showing up the next error in the browser:
and all this is coming form the error.log when trying to access:
...ANSWER
Answered 2020-Dec-16 at 14:42Was the servers version of django upgraded? patterns was deprecated in 1.10
https://stackoverflow.com/a/38799716/1464664
current implementations looks like this
QUESTION
Using python's rdflib, I am trying to insert new triples into a graph based on some basic manipulations with existing triples. For instance, in this basic example, I create a graph that I populate using INSERT DATA with 4 triples. I then try to "symmetrize" the situation with INSERT, but this fails. What am I doing wrong?
ANSWER
Answered 2020-Oct-29 at 00:04INSERT {GRAPH {?c ?b ?a.}} WHERE {GRAPH {?a ?b ?c.}}
This is not legal SPARQL. The GRAPH keyword in both the INSERT and the WHERE clauses needs to be followed by either a variable or an IRI indicating the source and target named graph.
Alternatively, if you are not interested in using named graphs and just want to modify the default graph, just remove the GRAPH keywords (and the extra curly braces) completely.
QUESTION
I'm using SPARQLWrapper to query a local SPARQL endpoint (using apache-jena-fuseki), and some of my queries are CONSTRUCT queries.
The query will give me valid results on web-based SPARQL interface, e.g. yasgui. When using SPARQLWrapper, the default query method will give me this error:
...ANSWER
Answered 2020-Nov-05 at 17:35SPARQLWrapper defaults to adding
&format=turtle&output=turtle&results=turtle
to the request.
SPARQLWrapper has a method setOnlyConneg that turns off the adding of the additional query string parts.
The
WARN SPARQL Query: Unrecognize request parameter (ignored): resultshappens because Fuseki does understandresultsand logs a warning about it. It is just a warning.formatis a mechanism to override the proper HTTP content negotiation mechanism because in some situations it is hard to set the HTTP headers. This does not apply to SPARQLWrapper which does correctly setAccept:.format=turtleisn't in the list of names for a CONSTRUCT query.ttlis. (`turtle can be added to future version of Fuseki for completeness).
The best way is not to have the non-standard query string parameters with setOnlyConneg. SPARQLWrapper correctly sets the "Accept:" header in the request and Fuseki has content negotiation and will work with that header.
Community Discussions, Code Snippets contain sources that include Stack Exchange Network
Vulnerabilities
No vulnerabilities reported
Install rdflib
With pip you can also install rdflib from the git repository with one of the following options:.
RDFLib aims to be a pythonic RDF API. RDFLib’s main data object is a Graph which is a Python collection of RDF Subject, Predicate, Object Triples:.
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