这是我的代码
#!/usr/bin/python
# -*- coding: utf-8 -*-
import requests
from requests.auth import HTTPBasicAuth
from abc import ABCMeta, abstractmethod
class PPTSparqlClient:
"""Minimal Class to access PPT SparqlEndpoints"""
def __init__(self, endpoint, user, passw):
self.endpoint = endpoint;
self.user = user;
self.passw = passw;
self.defaultHeaders = { "accept":"application/sparql-results+json" }
self.defaultAuth = HTTPBasicAuth(self.user, self.passw)
def execute(self, query, handler=None):
r = requests.get(self.endpoint, auth=self.defaultAuth, headers=self.defaultHeaders, params={"query":query})
if (r.status_code==404):
raise Exception("404 : not found " + self.endpoint);
if (r.status_code==401):
raise Exception("401 : unauthorized " + self.user + " " + self.passw)
if(handler==None):
return r.json();
else:
j = r.json();
handler.startQueryResult(j["head"]["vars"]);
for bindingSet in j["results"]["bindings"]:
handler.handleSolution(bindingSet);
handler.endQueryResult();
class TupleQueryResultHandler:
"""Base Class of SPARQL SELECT Query handlers"""
@abstractmethod
def startQueryResult(self,heads):
pass;
@abstractmethod
def handleSolution(self,bindingSet):
pass;
@abstractmethod
def endQueryResult(self):
pass;
class TerminalPrinter(TupleQueryResultHandler):
"""Class to handle application/sparql-results+json results by printing them to the terminal"""
def startQueryResult(self,heads):
self.heads = heads;
for head in heads:
print "binding:"+head;
print ""
def handleSolution(self,bindingSet):
for head in self.heads:
print head+":"+bindingSet[head]["value"];
print "";
def main(endpoint, user, passw, query):
client = PPTSparqlClient(endpoint,user,passw);
try:
client.execute(query, TerminalPrinter());
except Exception as ex:
print ex.message
endpoint = "http://termmanagement.poolparty.biz/PoolParty/sparql/LawEnforcementSmall";
user = "username";
passw = "pass";
if __name__ =='__main__':
main(endpoint,user,passw,"SELECT * WHERE { ?s ?p ?o } LIMIT 10")
这是我得到的输出：
binding:s
binding:p
binding:o
s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://www.w3.org/1999/02/22-rdf-syntax-ns#type
o:http://rdfs.org/ns/void#Dataset
s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://purl.org/dc/terms/creator
o:doanem
s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://purl.org/dc/terms/language
o:en
s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://www.semantic-web.at/ppcl/availablelanguages
o:en
s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://purl.org/dc/terms/date
o:2015-01-27T16:28:21Z
s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://purl.org/dc/terms/subject
o:video management
s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://purl.org/dc/terms/title
o:Law Enforcement
s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://rdfs.org/ns/void#sparqlEndpoint
o:http://termmanagement.poolparty.biz/PoolParty/sparql/LawEnforcement
s:http://termmanagement.poolparty.biz/LawEnforcementSmall
p:http://rdfs.org/ns/void#feature
o:node19dtn3sgfx1
s:node19dtn3sgfx1
p:http://www.w3.org/1999/02/22-rdf-syntax-ns#type
o:http://rdfs.org/ns/void#TechnicalFeature
如何将文件转换为 JSON 格式以进行进一步分析？我读过有一个内置的方法可以从 SPARQL 转换为 JSON。我怎样才能做到这一点？