import urllib
import xml.etree.ElementTree as ET
def getWeather(city):

    #create google weather api url
    url = "http://www.google.com/ig/api?weather=" + urllib.quote(city)

    try:
        # open google weather api url
        f = urllib.urlopen(url)
    except:
        # if there was an error opening the url, return
        return "Error opening url"

    # read contents to a string
    s = f.read()

    tree=ET.parse(s)

    current= tree.find("current_condition/condition")
    condition_data = current.get("data")  
    weather = condition_data  
    if weather == "<?xml version=":
        return "Invalid city"

    #return the weather condition
    #return weather

def main():
    while True:
        city = raw_input("Give me a city: ")
        weather = getWeather(city)
        print(weather)

if __name__ == "__main__":
     main()

gives error , I actually wanted to find values from google weather xml site tags