Python/Pandas - If last X instances = 0 then Y

I have a dataframe that has user IDs, which week they've logged on and how many sessions they had during that week. It looks similar to this:

ID	Week	Sessions
1	1	1
1	2	10
1	3	0
1	4	0
1	5	0
1	6	1
2	1	5
2	2	7
2	3	9
2	4	1
2	5	0
2	6	3
2	7	2
3	1	8
3	2	2
3	3	0
3	4	0
3	5	0
3	6	0
3	7	0

I am looking to find out if a user has churned. Churn here is if in the last 3 weeks of a user's lifetime, they haven't had any session. In the example above it means that only user 3 churned (as the first user had a session at their last week).

Ideally the dataframe would look like this:

ID	Week	Sessions	Churn Session	Churned_user
3	1	8	0	1
3	2	2	0	1
3	3	0	0	1
3	4	0	0	1
3	5	0	1	1
3	6	0	0	1
3	7	0	0	1

How can I replicate the above?

Thank you.

source https://stackoverflow.com/questions/72942831/python-pandas-if-last-x-instances-0-then-y

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