How to download files over HTTP via python-urllib2 correctly?

Question

I've written parser on python to download images from Internet:

import urllib2

for i in xrange(1,10):
  r = urllib2.urlopen('http://example.com/'+str(i)+'.gif'))
  f = open('C:\\' + str(i) + '.gif', 'w+')
  f.write(r.read())
  f.close()

Images can't be opened. Windows says 'Error while building image'. But I've found that every line of received file less on 1 byte than this line of original file, but both look similar. How to download correct file?

Answer 1

When working with windows you may need to put the "binary" flag b in open...

f = open(r'C:\\'+str(i)+'.gif','wb')

Answer 2

On Windows you need to specify 'wb', not 'w+'