Add query to SPARQLwrapper strategy

[torhaugl]

Description

Add query to SPARQLwrapper backend. The result follows the same format as rdflib backend.

Can be tested with the following Python code if you have a SPARQL endpoint,

from tripper import SparqlwrapperStrategy
endpoint = "YOUR_ENDPOINT" #something like r"http://IP:PORT/repositories/TOPMAST"
ts = SparqlwrapperStrategy(endpoint)
res = ts.query(r"SELECT ?s ?p ?o WHERE { ?s ?p ?o . } LIMIT 1000")
print(res)

Type of change

• Bug fix and code cleanup
• New feature
• Documentation update
• Testing

Checklist for the reviewer

This checklist should be used as a help for the reviewer.

• Is the change limited to one issue?
• Does this PR close the issue?
• Is the code easy to read and understand?
• Do all new feature have an accompanying new test?
• Has the documentation been updated as necessary?
• Is the code properly tested?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.39%. Comparing base (f01f6ec) to head (740a2a0).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #269      +/-   ##
==========================================
+ Coverage   79.30%   79.39%   +0.08%     
==========================================
  Files          18       18              
  Lines        1735     1742       +7     
==========================================
+ Hits         1376     1383       +7     
  Misses        359      359              

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[jesper-friis]

Can be tested with the following Python code if you have a SPARQL endpoint,

from tripper import SparqlwrapperStrategy
endpoint = "YOUR_ENDPOINT" #something like r"http://IP:PORT/repositories/TOPMAST"
ts = SparqlwrapperStrategy(endpoint)
res = ts.query(r"SELECT ?s ?p ?o WHERE { ?s ?p ?o . } LIMIT 1000")
print(res)

The example should be rewritten as

from tripper import Triplestore
endpoint = "YOUR_ENDPOINT" #something like r"http://IP:PORT/repositories/TOPMAST"
ts = Triplestore(backend="sparqlwrapper", base_iri=endpoint)
res = ts.query(r"SELECT ?s ?p ?o WHERE { ?s ?p ?o . } LIMIT 20")
print(res)

Works great!

[jesper-friis]

Works nicely. But please have a look at the comments.

[torhaugl]

I have added a test and adressed the comments. In addition I added a simple SPARQL query test which requires an internet connection. Please have a new look