Pure Python doesn't provide a way to mutate existing traceback objects or create arbitrary traceback objects.
>>> exc_info[2].tb_next = None
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: readonly attribute
>>> types.TracebackType()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: cannot create 'traceback' instances
Note that if it were possible to do this you wouldn't just affect the default formatting of tracebacks, you'd also interfere with people's ability to use pdb to post-mortem errors in your utility module.
If the traceback is being logged or otherwise formatted by your utility module then you can just not include the frames you consider uninteresting in the output. For instance, the standard library's unittest module does this when reporting errors that occur while running tests.
