PubSub: 0.38.0 produces import error fo 'IAMPolicyStub'

[goern]

Please run down the following list and make sure you've tried the usual "quick fixes":

Environment details

1. Cloud PubSub, Hangouts Chat
2. OS

NAME=Fedora
VERSION="29 (Workstation Edition)"
ID=fedora
VERSION_ID=29
PLATFORM_ID="platform:f29"
PRETTY_NAME="Fedora 29 (Workstation Edition)"
ANSI_COLOR="0;34"
CPE_NAME="cpe:/o:fedoraproject:fedora:29"
HOME_URL="https://fedoraproject.org/"
DOCUMENTATION_URL="https://docs.fedoraproject.org/en-US/fedora/f29/system-administrators-guide/"
SUPPORT_URL="https://fedoraproject.org/wiki/Communicating_and_getting_help"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="Fedora"
REDHAT_BUGZILLA_PRODUCT_VERSION=29
REDHAT_SUPPORT_PRODUCT="Fedora"
REDHAT_SUPPORT_PRODUCT_VERSION=29
PRIVACY_POLICY_URL="https://fedoraproject.org/wiki/Legal:PrivacyPolicy"
VARIANT="Workstation Edition"
VARIANT_ID=workstation

3. Python version and virtual environment information: Python 3.6.6
4. google-cloud- version: pip show google-<service> or pip freeze

aiofiles==0.4.0
aniso8601==3.0.2
apispec==1.0.0b5
apistar==0.6.0
asgiref==2.3.2
async-timeout==3.0.1
cachetools==3.0.0
certifi==2018.10.15
chardet==3.0.4
Click==7.0
daiquiri==1.5.0
docopt==0.6.2
google-api-core==1.6.0a1
google-api-python-client==1.7.4
google-auth==1.6.1
google-auth-httplib2==0.0.3
google-cloud-pubsub==0.38.0
googleapis-common-protos==1.6.0b6
graphene==2.1.3
graphql-core==2.1
graphql-relay==0.4.5
graphql-server-core==1.1.1
grpc-google-iam-v1==0.11.4
grpcio==1.16.1
h11==0.8.1
httplib2==0.12.0
httptools==0.0.11
idna==2.7
itsdangerous==1.1.0
Jinja2==2.10
MarkupSafe==1.1.0
marshmallow==3.0.0b20
oauth2client==4.1.3
parse==1.9.0
prometheus-client==0.4.2
promise==2.2.1
protobuf==3.6.1
pyasn1==0.4.4
pyasn1-modules==0.2.2
python-multipart==0.0.5
pytz==2018.7
PyYAML==4.2b4
requests==2.20.1
requests-toolbelt==0.8.0
responder==1.1.1
rfc3986==1.1.0
rfc5424-logging-handler==1.3.0
rsa==4.0
Rx==1.6.1
sentry-sdk==0.5.4
six==1.11.0
starlette==0.7.4
thoth-common==0.4.0
tzlocal==2.0.0b1
uritemplate==3.0.0
urllib3==1.24.1
uvicorn==0.3.20
uvloop==0.12.0rc1
websockets==7.0
whitenoise==4.1.1

Steps to reproduce

1. git clone github.com:goern/sesheta-google-chatbot.git .
2. pipenv install
3. pipenv shell ./app.py

Code example

# example

Stack trace

./app.py                                                                                                                                                               
2018-11-15 13:57:06,018 [19189] INFO     root: Logging to a Sentry instance is turned off
2018-11-15 13:57:06,018 [19189] INFO     root: Logging to rsyslog endpoint is turned off
2018-11-15 13:57:06,024 [19189] CRITICAL root: Traceback (most recent call last):
  File "./app.py", line 50, in <module>
    subscriber = pubsub.SubscriberClient()
  File "/home/goern/.local/share/virtualenvs/google-chatbot-MYBzcWvJ/lib/python3.6/site-packages/google/cloud/pubsub_v1/subscriber/client.py", line 76, in __init__
    self._api = subscriber_client.SubscriberClient(**kwargs)
  File "/home/goern/.local/share/virtualenvs/google-chatbot-MYBzcWvJ/lib/python3.6/site-packages/google/cloud/pubsub_v1/gapic/subscriber_client.py", line 188, in __init__
    credentials=credentials,
  File "/home/goern/.local/share/virtualenvs/google-chatbot-MYBzcWvJ/lib/python3.6/site-packages/google/cloud/pubsub_v1/gapic/transports/subscriber_grpc_transport.py", line 72, in __init__
    'iam_policy_stub': iam_policy_pb2.IAMPolicyStub(channel),
AttributeError: module 'google.iam.v1.iam_policy_pb2' has no attribute 'IAMPolicyStub'

Making sure to follow these steps will guarantee the quickest resolution possible.

Thanks!

[tseaver]

Trying to reproduce by installing google-cloud-pubsub==0.38.0 in a fresh virtual environment:

$ python3.6 -m venv /tmp/gcp/6531
$ /tmp/gcp/6531/bin/pip install --upgrade setuptools pip wheel
...
Successfully installed cachetools-3.0.0 certifi-2018.10.15 chardet-3.0.4 google-api-core-1.5.2 google-auth-1.6.1 google-cloud-pubsub-0.38.0 googleapis-common-protos-1.5.5 grpc-google-iam-v1-0.11.4 grpcio-1.16.1 idna-2.7 protobuf-3.6.1 pyasn1-0.4.4 pyasn1-modules-0.2.2 pytz-2018.7 requests-2.20.1 rsa-4.0 six-1.11.0 urllib3-1.24.1
$ /tmp/gcp/6531/bin/pip freeze
-f file:///...
cachetools==3.0.0
certifi==2018.10.15
chardet==3.0.4
google-api-core==1.5.2
google-auth==1.6.1
google-cloud-pubsub==0.38.0
googleapis-common-protos==1.5.5
grpc-google-iam-v1==0.11.4
grpcio==1.16.1
idna==2.7
protobuf==3.6.1
pyasn1==0.4.4
pyasn1-modules==0.2.2
pytz==2018.7
requests==2.20.1
rsa==4.0
six==1.11.0
urllib3==1.24.1
$ export GOOGLE_APPLICATION_CREDENTIALS="/path/to/credentials.json"
$ /tmp/gcp/6531/bin/python

Python 3.6.7 (default, Oct 22 2018, 11:30:50) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from google.cloud import pubsub
>>> client = pubsub.SubscriberClient()
>>> import google.iam.v1.iam_policy_pb2
>>> google.iam.v1.iam_policy_pb2.IAMPolicyStub
<class 'google.iam.v1.iam_policy_pb2.IAMPolicyStub'>

Can you check the actually-installed version of grpc-google-iam-v1, and that the imported file is the one you expect? E.g. via:

>>> import pkg_resources
>>> pkg_resources.get_distribution('grpc-google-iam-v1').version
'0.11.4'
>>> import google.iam.v1.iam_policy_pb2
>>> google.iam.v1.iam_policy_pb2.__file__
'/tmp/gcp/6531/lib/python3.6/site-packages/google/iam/v1/iam_policy_pb2.py'