Python.Extracting Data from XML

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

XML地址：http://python-data.dr-chuck.net/comments_290545.xml  (Sum
ends with 57)

Python源码：

import urllib
import xml.etree.ElementTree as ET

url = raw_input('Enter location: ')
uh = urllib.urlopen(url)
data = uh.read()
print 'Retrieved',len(data),'characters'
tree = ET.fromstring(data)

counts = tree.findall('.//comment')

lst = list()
for count in counts:
count = int(count.find('.//count').text)
lst.append(count)
print sum(lst)运行结果：
Enter location: http://python-data.dr-chuck.net/comments_290545.xml Retrieved 4204 characters
2457