I needed a way to download all photos in sets from Flickr. This is the script.
Make sure you register for Flickr API keys. Google it, or wait patiently and I'll add the right link when I have a chance.
Then run the authenticate.py script or the following steps in Python console:
import flickr_api
flickr_api.set_keys(api_key = 'my_api_key', api_secret = 'my_secret')
a = flickr_api.auth.AuthHandler()
url = a.get_authorization_url("read")
print(url)
# go visit that url and accept the token
# then copy and paste the oauth_verifier field below
a.set_verifier('oauth_verifier field')
a.save(".flickr_token")