Python - getting 401 error code on a simple token request

[Suberri]

I just join goodreads developer community and received a key and a secret key.
I tried a simple Python script and I am always get 401 as a response.

The python script:
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import oauth2 as oauth
import urlparse

gr_key= the key I received from goodreads today
gr_secret= he key I received from goodreads today

url = 'http://www.goodreads.com'
request_token_url = '%s/oauth/request_token/' % url
authorize_url = '%s/oauth/authorize/' % url
access_token_url = '%s/oauth/access_token/' % url

consumer = oauth.Consumer(key=gr_key,secret=gr_secret)

client = oauth.Client(consumer)

response, content = client.request(request_token_url, 'GET')
if response['status'] != '200':
raise Exception('Invalid response: %s' % response['status'])

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any idea why am I getting 401.
Are the keys that goodreads send me can be used immediately?
Do I need to add the application name somewhere?

[Suberri]

The curl command with my key does work