[issue39766] unittest's assertRaises removes locals from tracebacks

[Jackson Riley]

Jackson Riley  added the comment:

+1 - I was surprised not to be able to get locals from many of the frames in 
pdb upon an unexpected exception being raised inside an assertRaises. Thanks 
for raising this issue Daniel.

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[issue39766] unittest's assertRaises removes locals from tracebacks

[STINNER Victor]

Change by STINNER Victor :


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[issue39766] unittest's assertRaises removes locals from tracebacks

[daniel hahler]

daniel hahler  added the comment:

The test for issue9815 passes since bbd3cf8f1e (bpo-23890).

It seems like `traceback.clear_frames(tb)` should probably removed altogether?

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[issue39766] unittest's assertRaises removes locals from tracebacks

[daniel hahler]

New submission from daniel hahler :

I was a bit surprised to find that unittest's assertRaises clears the locals on 
the traceback, which e.g. prevents pytest to display them in case of failures.

This was done via https://bugs.python.org/issue9815 
(https://github.com/python/cpython/commit/9681022f1ee5c6c9160c515b24d2a3d1efe8b90d).

Maybe this should only get done for expected failures, so that unexpected 
exceptions can be inspected better?

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components: Library (Lib)
messages: 362744
nosy: blueyed
priority: normal
severity: normal
status: open
title: unittest's assertRaises removes locals from tracebacks
versions: Python 3.5, Python 3.6, Python 3.7, Python 3.8, Python 3.9

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