util.py 文件源码

def get_random_dois(n):
    url = u"http://api.crossref.org/works?filter=from-pub-date:2006-01-01&sample={}".format(n)
    r = requests.get(url)
    items = r.json()["message"]["items"]
    dois = [item["DOI"] for item in items]
    print dois

# from https://github.com/elastic/elasticsearch-py/issues/374
# to work around unicode problem
# import elasticsearch
# class JSONSerializerPython2(elasticsearch.serializer.JSONSerializer):
#     """Override elasticsearch library serializer to ensure it encodes utf characters during json dump.
#     See original at: https://github.com/elastic/elasticsearch-py/blob/master/elasticsearch/serializer.py#L42
#     A description of how ensure_ascii encodes unicode characters to ensure they can be sent across the wire
#     as ascii can be found here: https://docs.python.org/2/library/json.html#basic-usage
#     """
#     def dumps(self, data):
#         # don't serialize strings
#         if isinstance(data, elasticsearch.compat.string_types):
#             return data
#         try:
#             return json.dumps(data, default=self.default, ensure_ascii=True)
#         except (ValueError, TypeError) as e:
#             raise elasticsearch.exceptions.SerializationError(data, e)