This repository was archived by the owner on Mar 7, 2020. It is now read-only.

Description

This occurred on Python 3.6 and 3.7.
Looks like flask_oauthlib has been deprecated and has changed to authlib so no point reporting this issue on that repo.
However, I resolved this error by including the specific modules in \Python3x\Lib\site-packages\flask_oauthlib\client.py:
from werkzeug.urls import url_quote, url_decode, url_encode
from werkzeug.http import parse_options_header
from werkzeug.utils import cached_property
This was the only roadblock I experienced using this example - hope it helps someone.