tracebacks on connect from discovery_cache - "ModuleNotFoundError: No module named 'google'" on 18.04/bionic

With python3-googleapi 1.5.5-1 installed on ubuntu 18.04 bionic system we get several tracebacks on connect/discovery related to discovery_cache and module load:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/googleapiclient/discovery_cache/__init__.py", line 36, in autodetect
    from google.appengine.api import memcache
ModuleNotFoundError: No module named 'google'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/googleapiclient/discovery_cache/file_cache.py", line 33, in <module>
    from oauth2client.contrib.locked_file import LockedFile
ModuleNotFoundError: No module named 'oauth2client.contrib.locked_file'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/googleapiclient/discovery_cache/file_cache.py", line 37, in <module>
    from oauth2client.locked_file import LockedFile
ModuleNotFoundError: No module named 'oauth2client.locked_file'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/googleapiclient/discovery_cache/__init__.py", line 41, in autodetect
    from . import file_cache
  File "/usr/lib/python3/dist-packages/googleapiclient/discovery_cache/file_cache.py", line 41, in <module>
    'file_cache is unavailable when using oauth2client >= 4.0.0')
ImportError: file_cache is unavailable when using oauth2client >= 4.0.0

On bionic exhibiting the above behavior the versions of the api client and oauth2 libs are:

log-archive@juju-bb6a75-log-archive-bionic-0:~$ dpkg -l | grep google
ii python3-googleapi 1.5.5-1 all Google APIs Client Library - Python 3.x

log-archive@juju-bb6a75-log-archive-bionic-0:~$ dpkg -l | grep oauth
ii python3-oauth2client 4.1.2-3 all OAuth 2.0 client library - Python 3.x
ii python3-oauthlib 2.0.6-1 all generic, spec-compliant implementation of OAuth for Python3

This does not occur on a 16.04/xenial system running python3-googleapi version 1.4.2-1ubuntu1.1

It also does not occur on artful which is also 1.5.5-1 but with earlier oauth2client:

log-archive@juju-bb823a-log-archive-artful-0:~$ dpkg -l | grep google
ii python3-googleapi 1.5.5-1 all Google APIs Client Library - Python 3.x
log-archive@juju-bb823a-log-archive-artful-0:~$ dpkg -l | grep oauth
ii python3-oauth2client 3.0.0-1 all OAuth 2.0 client library - Python 3.x
ii python3-oauthlib 2.0.1-1