How to store the triples in 4store

Question

 File "<console>", line 1, in <module>
  File "/usr/local/lib/python2.7/dist-packages/django_gstudio-0.3.dev-py2.7.egg/gstudio/testing1.py", line 129, in rdf_description
    store.add(self,(subject, predicate, object),context)
  File "/usr/local/lib/python2.7/dist-packages/rdflib-3.2.0-py2.7.egg/rdflib/plugins/memory.py", line 298, in add
    Store.add(self, triple, context, quoted)
  File "/usr/local/lib/python2.7/dist-packages/rdflib-3.2.0-py2.7.egg/rdflib/store.py", line 177, in add
    def add(self, (subject, predicate, object), context, quoted=False):
in 

store.add(self, (subject, predicate, object), context, quoted=False)

Answer 1

AFAIK - rdflib does not support 4store. But you can easily assert the triples using curl and python and the 4store SPARQL Server. Here there is an example:

 import subprocess
 command = ["curl","-s",
            "-T","/some/file/with/triples",
            "-H","Content-Type: application/x-turtle",
            "http://localhost:port/data/http://graph.to/save/triples"]

  p = subprocess.Popen(command,stdout=subprocess.PIPE,stderr=subprocess.PIPE)
  output, err = p.communicate()
  ret = p.poll()
  if ret <> 0:
     raise Exception, "Error asserting triples"

In this example the content type is turtle but you can use any of the other RDF serializations (ntriples, rdfxml).

If you do not want to deal with subprocesses you can also translate this call into a urllib/urllib2 function.

There are more examples in the 4store SparqlServer documentation. And, optionally, you can use any of the Python 4store client libraries.