[Python] Google Cloud Function - ImportError: cannot import name 'pubsub' from 'google.cloud'...

I am deploying a Google Cloud Function that will kick off other Google Cloud Functions using google.cloud.pubsub_v1 and I'm getting this error ImportError: cannot import name 'pubsub' from 'google.cloud' (unknown location)

The beginning of my requirements.txt file looks like this

# Function dependencies, for example:
# package>=version
google-cloud-pubsub
....


The beginning of my main.py script looks like this:

import base64
import json
from google.cloud import pubsub_v1

publisher = pubsub_v1.PublisherClient()
topic_path = publisher.topic_path(<PROJECT_ID>, <PUBSUB_TOPIC>)


I am deploying this code from a Google Cloud Source Repository. I have read through this SO post about my error, but that question appears to be about this error arising in a Client application. My error is being generated by the Google Cloud function itself during the deploy process. I don't have sudo rights to the auto-created VM that Google is using to run my process, do I? I should be able to resolve this issue from the requirements.txt file, but nothing I've tried seems to be working.

What's more frustrating is that when I put this same code in the "Inline editor" on the web-based Google Function editor, I don't get an error. I only get this error when loading the code from the repository.

The current file structure in the repository looks something like this:

.
├── package
| ├── main.py
| ├── script1.py
| └── script2.py
├── package2
├── ...
└── requirements.txt


I moved main.py inside of a package because of issues I was having in this SO Question

Any ideas on how to resolve this import error?

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