Parsing XML

gistfile1.py

# Python 3
# http://www.reddit.com/r/learnpython/comments/13ugqf/getting_information_from_xml_python_3/
from xml.etree import ElementTree as ET
from urllib import request


URL = 'http://weather.yahooapis.com/forecastrss?w=3369&u=c'

# XML name-space for yweather elements. Note you have to use the correct
# name-space when selecting elements, which is what all the '{%s}' stuff
# is about. Also note ElementTree's XPath implementation is currently stupid,
# but works fine if you know how stupid it is.
NS = 'http://xml.weather.yahoo.com/ns/rss/1.0'

def main(url):
    # Fetch XML response.
    response = request.urlopen(url)
    
    # Parse the response with ElementTree
    tree = ET.parse(response)
    
    # Wind chill and atmosphere are nested in the <channel> tag
    wind_element = tree.find('./channel/{%s}wind' % NS)
    atmos_element = tree.find('./channel/{%s}atmosphere' % NS)
    
    print('wind:', wind_element.attrib)
    print('atmosphere:', atmos_element.attrib)
    
    # Forecast with temperature belongs to repeating <item> elements
    for cond_element in tree.findall('./channel/item/{%s}condition' % NS):
        print('condition:', cond_element.attrib)
    
    for forecast_element in tree.findall('./channel/item/{%s}forecast' % NS):
        print('forecast:', forecast_element.attrib)


if __name__ == "__main__":
    main(URL)