In which file did you encounter the issue?

https://github.com/GoogleCloudPlatform/python-docs-samples/blob/master/pubsub/cloud-client/subscriber.py

Did you change the file? If so, how?

No.

Describe the issue

There are no examples in Python for creating push subscriptions (it's totally possible to do, but I had to figure how to do so by reading the code and trial and error in a REPL), nor for updating said subscriptions. I tried figuring out how to update a push subscription's push_endpoint, but I couldn't sort out how to correctly make either a FieldMask or a dict with similar structure. I tried looking here to figure out what a FieldMask is supposed to look like, but it's autogenerated and looks like gibberish to me. Comment says to look in google/cloud/pubsub_v1/proto/pubsub.proto file that doesn't appear to be there.

When in doubt, more examples are better than just one, but one would be infinitely better than none.