Python.Extracting Data from JSON

The program will prompt for a URL, read the JSON data from that URL using urllib and
then parse and extract the comment counts from the JSON data, compute the sum of the numbers in the file and enter the sum below

JSON地址：http://python-data.dr-chuck.net/comments_290549.json (Sum
ends with 90)

Python源码：

import urllib
import json

inp = raw_input('Enter location:')
url = urllib.urlopen(inp).read()
data = json.loads(url)

info = data['comments']
leng = len(info)
sum = 0
for i in range(leng):
num = info[i-1]['count']
sum = sum + num
print sum

运行结果：
Enter location:http://python-data.dr-chuck.net/comments_290549.json
2790