This threw me for a loop for a second. I had to str(myUUID) to be able to use it as the distinct_id in all calls.

Since the documentation often shows UUIDs and doesn't explain that distinct_id should be a Number or string_types, it might be worth adding uuid.UUID to ID_TYPES at https://github.com/PostHog/posthog-python/blob/master/posthog/client.py#L24

Of course, one would need to cast the UUID to str() as well.