python执行get提交的方法

import sys, urllib2, urllib
def addGETdata(url, data):
  """Adds data to url. Data should be a list 
  or tuple consisting of 2-item
  lists or tuples of the form: (key, value).
  Items that have no key should have key set to None.
  A given key may occur more than once.
  """
  return url + '?' + urllib.urlencode(data)
zipcode = 'S2S 7U8'
url = addGETdata('http://www.yoursiteweb.com/getForecast',
         [('query', zipcode)])
print "Using URL", url
req = urllib2.Request(url)
fd = urllib2.urlopen(req)
while 1:
  data = fd.read(1024)
  if not len(data):
    break
  sys.stdout.write(data)