cacootest.py

from random import getrandbits
from time import time
import hmac, hashlib
import sys
import urllib
import urllib2
import urlparse

# build parameters to post
consumer_key = 'your <consumer_key>'
consumer_secret = 'your <consumer_secret'
token_key = 'your <token_key>'
token_secret = 'your <token_secret>'
message = ''

post_url = 'https://cacoo.com/api/v1/users/sinsoku.xml'

params = {
  'oauth_consumer_key' : consumer_key,
  'oauth_signature_method' : 'HMAC-SHA1',
  'oauth_timestamp' : str(int(time())),
  'oauth_nonce' : str(getrandbits(64)),
  'oauth_version' : '1.0',
  'oauth_token' : token_key,
}
params['status'] = urllib.quote(message, '')
params['oauth_signature'] = hmac.new(
  '%s&%s' % (consumer_secret, token_secret),
  '&'.join([
      'POST',
      urllib.quote(post_url, ''),
      urllib.quote('&'.join(['%s=%s' % (x, params[x])
          for x in sorted(params)]), '')
  ]),
  hashlib.sha1).digest().encode('base64').strip()
del params['status']

# post with oauth token
req = urllib2.Request(post_url, data = urllib.urlencode(params))
req.add_data(urllib.urlencode({'status' : message}))
req.add_header('Authorization', 'OAuth %s' % ', '.join(
  ['%s="%s"' % (x, urllib.quote(params[x], '')) for x in params]))

# done!
print urllib2.urlopen(req).read()

下記のソースを元に作成

Big Sky :: デスクトップアプリケーションでも認証可能なOAuth「xAuth」をpythonから試してみた。
http://mattn.kaoriya.net/software/lang/python/20100217004716.htm