import urllib, time, hashlib, hmac, base64, urllib3

def _create_nonce():
    return int(time.time()*100000)

url = "https://mtgox.com/api/0/info.php"
params = [(u"nonce", _create_nonce())]
headers = {'Rest-Key': key, 'Rest-Sign': base64.b64encode(str(hmac.new(base64.b64decode(secret), urllib.urlencode(params), hashlib.sha512).digest())), 'Content-type': 'application/x-www-form-urlencoded', 'Accept': 'application/json, text/javascript, */*; q=0.01', 'User-Agent': 'Mozilla/4.0 (compatible; MSIE 5.5; Windows NT)'}
http_pool = urllib3.connection_from_url(url)
response = http_pool.urlopen('POST', url, body=urllib.urlencode(params), headers=headers)

print response.status, response.data

200 {"error":"Must be logged in"}