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gh-113358: Fix rendering tracebacks with exceptions with a broken __getattr__ #113359

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Merged
merged 5 commits into from
Jan 16, 2024
Merged

gh-113358: Fix rendering tracebacks with exceptions with a broken __getattr__ #113359

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1f40d5f
Fix rendering tracebacks with exceptions with a broken __getattr__
perrinjerome Dec 21, 2023
9eed42e
📜🤖 Added by blurb_it.
blurb-it[bot] Dec 21, 2023
8651d3e
Display error accessing __notes__ along with the traceback
perrinjerome Jan 15, 2024
6ecf82d
fixup! Display error accessing __notes__ along with the traceback
perrinjerome Jan 15, 2024
6c6867a
Apply suggestions from code review
perrinjerome Jan 15, 2024
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14 changes: 14 additions & 0 deletions Lib/test/test_traceback.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2209,6 +2209,20 @@ def __repr__(self):
err_msg = "b'please do not show me as numbers'"
self.assertEqual(self.get_report(e), vanilla + err_msg + '\n')

# an exception with a broken __getattr__ raising a non expected error
class BrokenException(Exception):
broken = False
def __getattr__(self, name):
if self.broken:
raise ValueError(f'no {name}')

e = BrokenException(123)
vanilla = self.get_report(e)
e.broken = True
self.assertEqual(
self.get_report(e),
vanilla + "Ignored error getting __notes__: ValueError('no __notes__')\n")

def test_exception_with_multiple_notes(self):
for e in [ValueError(42), SyntaxError('bad syntax')]:
with self.subTest(e=e):
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6 changes: 5 additions & 1 deletion Lib/traceback.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1051,7 +1051,11 @@ def __init__(self, exc_type, exc_value, exc_traceback, *, limit=None,
# Capture now to permit freeing resources: only complication is in the
# unofficial API _format_final_exc_line
self._str = _safe_string(exc_value, 'exception')
self.__notes__ = getattr(exc_value, '__notes__', None)
try:
self.__notes__ = getattr(exc_value, '__notes__', None)
except Exception as e:
self.__notes__ = [
f'Ignored error getting __notes__: {_safe_string(e, '__notes__', repr)}']

self._is_syntax_error = False
self._have_exc_type = exc_type is not None
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2023-12-21-14-55-06.gh-issue-113358.nRkiSL.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix rendering tracebacks with exceptions with a broken __getattr__