Get the unique repliy list from v2ex.com

uniq_replies.py

# -*- coding: utf-8 -*-
from functools import reduce
from urllib import request
import argparse
import json


if __name__ == '__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument("topic", type=int, nargs='?', default=293899)
    args = parser.parse_args()


API_REPLIES = r"http://www.v2ex.com/api/replies/show.json?topic_id={}".format


def uniq_replies(topic_id):
    with request.urlopen(API_REPLIES(topic_id)) as httpfd:
        response = httpfd.read()
    result = json.loads(response.decode())
    replies = (x['member']['username'] for x in result)
    uniq_lst = reduce(lambda x, y: x if y in x else x + [y], replies, [])

    return enumerate(uniq_lst)


if __name__ == '__main__':
    for each in uniq_replies(args.topic):
        print(each)