Hi Asaf,
Thank you for bringing this to our attention! I'm the maintainer of the Python library and this appears to be a bug in the example that we need to fix. I've created an issue on the repository to track it, please see here:
https://github.com/googleads/google-ads-python/issues/158
In the meantime you can manually edit the example so the two new parameters (email_address and access_role) described in
this documentation are passed into the call to customer_service.create_customer_client.
Hope this helps, if you have any additional questions about this problem or the Python library please comment on the above issue or open a new issue.
Best,
Ben Karl, Google Ads API Team

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