keystone-manage bootstrap throws an import error

[Can Özyurt]

Fresh install keystone:2:17.0.1-0ubuntu1 on Focal

keystone:
  Installed: 2:17.0.1-0ubuntu1
  Candidate: 2:17.0.1-0ubuntu1
  Version table:
 *** 2:17.0.1-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     2:17.0.0~b3~git2020041013.7bb6314e4-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages

root@control:~# keystone-manage bootstrap --bootstrap-password password --bootstrap-admin-url http://control:5000/v3/ --bootstrap-internal-url http://control:5000/v3/ --bootstrap-public-url http://control:5000/v3/ --bootstrap-region-id RegionOne

output: https://pastebin.com/wG2JYc97

Bug report: https://github.com/flask-restful/flask-restful/pull/913
Fix proposed in 0.3.9: https://github.com/flask-restful/flask-restful/pull/915/files

Currently available:

python3-flask-restful:
  Installed: 0.3.8-1
  Candidate: 0.3.8-1
  Version table:
 *** 0.3.8-1 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
        100 /var/lib/dpkg/status

lsb_release -rd:
Description: Ubuntu 20.04.4 LTS
Release: 20.04