Python: A more concise syntax for variable assignment when accessing a NoneType object

Question

Say, I have the following Python code

if obj is None:
  identifier = None
else:
  identifier = obj.id

where obj is a Python object whose class definition is not included

I barely remember there's a more concise syntax (like a one-line code?) that can achieve the same. If I wasn't dreaming, can someone please advise what that simpler syntax might be? Thanks.

Answer 1

identifier = None if obj is None else obj.id

Answer 2

identifier = getattr(obj, "id", None)