This is how I call a JSON service from Python code

import json
import urllib2
    def clasic_json_call(self, endpoint, data):
        req = urllib2.Request(endpoint, data, self.headers)
        try:
            response = urllib2.urlopen(req)
            the_page = response.read()
            decoded = json.loads(the_page)
        except:
            raise Warning('Error in the connection')
        else:
            return decoded