hashtags.py

import json
import re

with open('hashtag-shares.json') as f:
    rows = f.readlines()

hashtags = dict()

for row in rows:
    share = json.loads(row)
    for tag in re.findall(r'#\w+', share['message']):
        hashtag = hashtags.setdefault(tag.lower(), dict(tracks=[]))
        hashtag['tracks'].append(share['resource'])

for hashtag, data in hashtags.iteritems():
    print hashtag
    for track in data['tracks']:
        print '- %s' % track