Below is the code for my first Google OAuth2 Python program. The last time I had a look at it was something like 6 months ago - that long already? As I recall, the sample script file blogger.py that was bundled in 'google-api-python-client-samples-1.2.zip', if I am not mistaken, by Google didn't work. I had to debug it myself to get it working.
What this program does is to print out the user's Google login name, the list of blogs at Blogger.com that is associated with this account and the list of blog entries for each blog. The OAuth2 login credentials is named 'plus.dat' and it must be located in the same directory as this Python script file.
I ran this script file under Python 2.4 with some customisation made to the Google API Python Client Library Version 1.2.
I hope somebody will find this useful.