Do not use assert in production Ansible python code. When running Python with optimizations, Python will remove assert statements, potentially allowing for unexpected behavior throughout the Ansible code base.

Instead of using assert you should utilize simple if statements, that result in raising an exception. There is a new exception called AnsibleAssertionError that inherits from AnsibleError and AssertionError. When possible, utilize a more specific exception than AnsibleAssertionError.

Modules will not have access to AnsibleAssertionError and should instead raise AssertionError, a more specific exception, or just use module.fail_json at the failure point.