[New-bugs-announce] [issue30384] traceback.TracebackException.format shouldn't format_exc_only() when __traceback__ is None

[Aaron Meurer]

New submission from Aaron Meurer:

I'm trying to completely hide an exception from the traceback module. From reading the source, it looks like the only way to do this is to set __traceback__ to None (I can also set __suppress_context__ to True, but that only works if I have another exception higher up in the context chain). 

However, this still prints the traceback itself, and the line for SyntaxErrors. Consider the attached test.py. It outputs

ValueError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 8, in <module>
    raise TypeError
TypeError

  File "<string>", line 1
    a b
      ^
SyntaxError: unexpected EOF while parsing

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "test.py", line 19, in <module>
    raise TypeError
TypeError

I suppose it should also not print the "During handling of the above exception, another exception occurred:" part.

----------
components: Library (Lib)
files: test.py
messages: 293837
nosy: Aaron.Meurer
priority: normal
severity: normal
status: open
title: traceback.TracebackException.format shouldn't format_exc_only() when __traceback__ is None
Added file: http://bugs.python.org/file46867/test.py

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30384>
_______________________________________