Unable to load DirectoryAuthPlugin with Python 3

[Jun Omae]

$ pyflakes tracext/dirauth/*.py
tracext/dirauth/__init__.py:11:1: 'from api import *' used; unable to detect undefined names
tracext/dirauth/__init__.py:11:1: 'api.*' imported but unused
tracext/dirauth/__init__.py:12:1: 'from auth import *' used; unable to detect undefined names
tracext/dirauth/__init__.py:12:1: 'auth.*' imported but unused
tracext/dirauth/auth.py:202:24: multiple exception types must be parenthesized
                except Exception, e:
                       ^

>>> import tracext.dirauth
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/dev/shm/venv-trac16/lib/python3.9/site-packages/tracext/dirauth/__init__.py", line 11, in <module>
    from api import *
ModuleNotFoundError: No module named 'api'