whatever.py

import requests
import urllib
import datetime

event = '443176'
sessionid = 175282
date = '2016-07-05'
time = '08:30:00'

sessiondata = requests.get('https://indico.cern.ch/export/event/{}/session/{}.json'.format(event,sessionid)).json()
thisone = [x for x in sessiondata['results'] if x['startDate']['time']==time][0]

contrib_data = []
for x in thisone['contributions']:
    time = datetime.datetime.strptime('{} {}'.format(x['startDate']['date'],x['startDate']['time']),'%Y-%m-%d %H:%M:%S')
    lastname =  x['speakers'][0]['last_name']
    attachments = [d['download_url'] for d in x['folders'][0]['attachments']]
    contrib_data += [(time,lastname,attachments)]

sorted_data = sorted(contrib_data,key = lambda x:x[0])
for i,x in enumerate(sorted_data):
    for j,att in enumerate(x[2]):
        urllib.urlretrieve (att, '{:03}-{:03}-{}.pdf'.format(i,j,x[1]))