使用python3的Knowledge Graph API

Question

我正在尝试使用Python3从Knowledge Graph API中提取信息，我尝试了多次调试该代码，但是找不到任何错误，但是却遇到了错误

这是我的代码

    #!/usr/bin/env python
"""
Query the Knowledge Graph API https://developers.google.com/knowledge-graph/
"""

import argparse
import datetime
import requests
import json
#import urllib
import urllib.request,urllib.parse,urllib.error


def main(query):
    api_key = open('.api_key').read()
    service_url = 'https://kgsearch.googleapis.com/v1/entities:search'

    params = {
        'query': query,
        'limit': 5,
        'indent': True,
        'key': api_key,
        }

    url = service_url + '?' + urllib.parse.urlencode(params)  # TODO: use requests
    response = json.loads(urllib.request.urlopen(url).read())

    # Parsing the response  TODO: log all responses
    print('Displaying results...' + ' (limit: ' + str(params['limit']) + ')\n')
    for element in response['itemListElement']:
        try:
            types = str(", ".join([n for n in element['result']['@type']]))
        except KeyError:
            types = "N/A"

        try:
            desc = str(element['result']['description'])
        except KeyError:
            desc = "N/A"

        try:
            detail_desc = str(element['result']['detailedDescription']['articleBody'])[0:100] + '...'
        except KeyError:
            detail_desc = "N/A"

        try:
            mid = str(element['result']['@id'])
        except KeyError:
            mid = "N/A"

        try:
            url = str(element['result']['url'])
        except KeyError:
            url = "N/A"

        try:
            score = str(element['resultScore'])
        except KeyError:
            score = "N/A"

        print(element['result']['name'] \
                + '\n' + ' - entity_types: ' + types \
                + '\n' + ' - description: ' + desc \
                + '\n' + ' - detailed_description: ' + detail_desc \
                + '\n' + ' - identifier: ' + mid \
                + '\n' + ' - url: ' + url \
                + '\n' + ' - resultScore: ' + score \
                + '\n')


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('query', help='The search term to query')
    args = parser.parse_args()
    main(args.query)

知识图文档中给出的源代码或示例基于python2，我更改了一些类似urlib包名称

我得到这个错误

Traceback (most recent call last):
  File "/usr/lib/python3.6/urllib/request.py", line 1318, in do_open
    encode_chunked=req.has_header('Transfer-encoding'))
  File "/usr/lib/python3.6/http/client.py", line 1239, in request
    self._send_request(method, url, body, headers, encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1285, in _send_request
    self.endheaders(body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1234, in endheaders
    self._send_output(message_body, encode_chunked=encode_chunked)
  File "/usr/lib/python3.6/http/client.py", line 1026, in _send_output
    self.send(msg)
  File "/usr/lib/python3.6/http/client.py", line 964, in send
    self.connect()
  File "/usr/lib/python3.6/http/client.py", line 1392, in connect
    super().connect()
  File "/usr/lib/python3.6/http/client.py", line 936, in connect
    (self.host,self.port), self.timeout, self.source_address)
  File "/usr/lib/python3.6/socket.py", line 704, in create_connection
    for res in getaddrinfo(host, port, 0, SOCK_STREAM):
  File "/usr/lib/python3.6/socket.py", line 745, in getaddrinfo
    for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
socket.gaierror: [Errno -2] Name or service not known

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "kg-api.py", line 75, in <module>
    main(args.query)
  File "kg-api.py", line 26, in main
    response = json.loads(urllib.request.urlopen(url).read())
  File "/usr/lib/python3.6/urllib/request.py", line 223, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.6/urllib/request.py", line 526, in open
    response = self._open(req, data)
  File "/usr/lib/python3.6/urllib/request.py", line 544, in _open
    '_open', req)
  File "/usr/lib/python3.6/urllib/request.py", line 504, in _call_chain
    result = func(*args)
  File "/usr/lib/python3.6/urllib/request.py", line 1361, in https_open
    context=self._context, check_hostname=self._check_hostname)
  File "/usr/lib/python3.6/urllib/request.py", line 1320, in do_open
    raise URLError(err)
urllib.error.URLError: <urlopen error [Errno -2] Name or service not known>