Here's the next attempt (took your advice about the convention):

Exception ignored in: <bound method A.__del__ of <__main__.A object at 0x1007671d0>>
Traceback (most recent call last):
  File "/tmp/bla.py", line 4, in __del__
    None.someattr
AttributeError: 'NoneType' object has no attribute 'someattr'

reminder of the current format for comparison:

Exception AttributeError: "'NoneType' object has no attribute 'someattr'" in <bound method A.__del__ of <__main__.A object at 0x1007671d0>> ignored

I thought about a more elaborate explanation than "Exception ignored" but grepping this function through the code shows it can be called from various places making it too generic.

The reason I wanted to add a header/footer is for stating the message and the traceback go together (I print tracebacks to screen all the time), but it might be TMI..