python3 github authorizaitons Oauth2 not working - python-3.x

Question

I'm trying to implement an oauth2 client in Python3 so that I can upload files to github. For a very basic start I'm trying to get a list of authorizations using the API.
This code works:
from subprocess import Popen,PIPE
user = 'MYUSERNAME'
pw = 'MYPASSWORD'
git_url = "https://api.github.com/authorizations"
res = Popen(['curl','--user',user + ':' + pw,git_url],stdout=PIPE,stderr=PIPE).communicate()[0]
print(res)
This code does not work:
user = 'MYUSERNAME'
pw = 'MYPASSWORD'
git_url = "https://api.github.com/authorizations"
import urllib.request
# Create an OpenerDirector with support for Basic HTTP Authentication...
auth_handler = urllib.request.HTTPBasicAuthHandler()
auth_handler.add_password(realm=None,
uri=git_url,
user=user,
passwd=pw)
opener = urllib.request.build_opener(auth_handler)
f = opener.open(git_url)
print(f.read())
In fact, it generates this error:
Traceback (most recent call last):
File "demo.py", line 18, in <module>
f = opener.open("https://api.github.com/authorizations")
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/urllib/request.py", line 375, in open
response = meth(req, response)
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/urllib/request.py", line 487, in http_response
'http', request, response, code, msg, hdrs)
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/urllib/request.py", line 413, in error
return self._call_chain(*args)
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/urllib/request.py", line 347, in _call_chain
result = func(*args)
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.2/lib/python3.2/urllib/request.py", line 495, in http_error_default
raise HTTPError(req.full_url, code, msg, hdrs, fp)
urllib.error.HTTPError: HTTP Error 404: Not Found
I know that there is an existing Oauth2 implementation in python, but it's python2, not python3, and it does a lot more than I need.
I also know that I could just have my Python program call curl, and that's my fallback.
I'd really like to know what I'm doing wrong.
Thanks.

Answer 1

I have just posted an answer to another question with a full example using urllib2 from python2. Obviously you are interested in python3, but it shouldn't be to difficult to migrate the code.
Hope that helps,