Programmatically obtain the GCP access token. The equivalent of CLI $(gcloud auth print-access-token)

gistfile1.py

## programmatically obtain the GCP access token. 
## This is the equivalent of CLI $(gcloud auth print-access-token)
import google.auth
import google.auth.transport.requests
creds, project = google.auth.default()

# creds.valid is False, and creds.token is None
# Need to refresh credentials to populate those

auth_req = google.auth.transport.requests.Request()
creds.refresh(auth_req)

# Now you can use creds.token
logging.info("creds.token "+creds.token)