Launchpadlib how to get bug id from bug_link

I'm not sure if this is a python question or a launchpad question since I am new to both. I am getting a collection of bugs in a bug_task collection. I am running searchTasks. The API reference documentation says bug_link is a link to a bug object. The bug object has the id. I was hoping to be able to print out the bug id by just getting the attribute, but that is not working.

Here is the relevant snippet of code:

bug_tasks = series.searchTasks(status=['New'],importance=['Critical'])
for bug in bug_tasks:
    print(bug)
    bug_link=bug.bug_link
    bug_id=bug_link.id
    print(bug_id)

When I run the script, I get the error

https://api.launchpad.net/devel/ubuntu/xenial/+source/linux/+bug/1626158
Traceback (most recent call last):
  File "./get_ubuntu_bug_list.py", line 39, in <module>
    bug_id=bug_link.id
AttributeError: 'unicode' object has no attribute 'id'

I've also tried

bug_id=bug_link.get(id)
bug_id=get(bug_link.id)
bug_id=get(bug_link).id

None of those worked.

Any help on how to get the bug id from bug_link would be appreciated.

Thank you