How do I modify the stack list of sys.exc_info()?

Question

I'd like to remove a couple of frames from the stack list that represent a decorator before logging it, but when I try to get to it, the debugger says that there is no such attribute as stack even though PyCharm shows it:

sys.exc_info()[2].tb_frame.stack  # <-- AttributeError, but why?

This is what I would like to do:

sys.exc_info()[2].tb_frame.stack = sys.exc_info()[2].tb_frame.stack[3:]

Answer 1

FWIW, I can't see an attribute for stack on a traceback.tb_frame object in python 3.8:

try:
    raise Exception('test')
except:
    cls, e, tb = sys.exc_info()

hasattr(tb.tb_frame, 'stack')
False

You can probably do this in a for loop by tracing the tb_next attribute on the traceback:

try:
    do_something()
except Exception as e:
    cls, exc, tb = sys.exc_info()

    for _ in range(3):
        tb_next = tb.tb_next

        # in case you don't have that many frames
        if not tb_next:
            break

        tb = tb_next

    raise cls.with_traceback(tb)