import urllib2
import time
url = raw_input("URL: ")
url += ".json"
prev = 0
while True:
try:
response = urllib2.urlopen(url)
except:
break
json = response.read()
pos = json.find('num_comments')
num = int(json[pos+15:json.find(',',pos)])
if num > prev:
print "Number of comments: ", num
prev = num
time.sleep(1)