Scrap a value from website

[harsush]

Iam trying scrap trade date value -- below is what i have written, but not getting the value. Can someone help on this.

#!/usr/bin/env python
import urllib2, json
ua = { 'User-Agent' : 'Mozilla/5.0' }
request = urllib2.Request('http://www.cmegroup.com/CmeWS/mvc/TimeandSales/300/G/N8?timeSlot=16&entryDate=20180522&pageNumber=1&_=1527157308610', headers=ua)
response = urllib2.urlopen(request)
data = json.loads(response.read())
response.close()
print data['tradeDate']