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gh-87822: Make traceback module robust to exceptions from repr() of local values (GH-94691)
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@ -341,6 +341,10 @@ capture data for later printing in a lightweight fashion.
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local variables in each :class:`FrameSummary` are captured as object
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representations.
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.. versionchanged:: 3.12
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Exceptions raised from :func:`repr` on a local variable (when
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*capture_locals* is ``True``) are no longer propagated to the caller.
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.. classmethod:: from_list(a_list)
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Construct a :class:`StackSummary` object from a supplied list of
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@ -2279,6 +2279,9 @@ def format_frame_summary(self, frame_summary):
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f' File "{__file__}", line {lno}, in f\n 1/0\n'
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)
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class Unrepresentable:
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def __repr__(self) -> str:
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raise Exception("Unrepresentable")
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class TestTracebackException(unittest.TestCase):
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@ -2546,12 +2549,13 @@ def test_locals(self):
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linecache.updatecache('/foo.py', globals())
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e = Exception("uh oh")
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c = test_code('/foo.py', 'method')
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f = test_frame(c, globals(), {'something': 1, 'other': 'string'})
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f = test_frame(c, globals(), {'something': 1, 'other': 'string', 'unrepresentable': Unrepresentable()})
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tb = test_tb(f, 6, None, 0)
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exc = traceback.TracebackException(
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Exception, e, tb, capture_locals=True)
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self.assertEqual(
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exc.stack[0].locals, {'something': '1', 'other': "'string'"})
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exc.stack[0].locals,
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{'something': '1', 'other': "'string'", 'unrepresentable': '<local repr() failed>'})
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def test_no_locals(self):
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linecache.updatecache('/foo.py', globals())
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@ -279,7 +279,8 @@ def __init__(self, filename, lineno, name, *, lookup_line=True,
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self._line = line
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if lookup_line:
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self.line
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self.locals = {k: repr(v) for k, v in locals.items()} if locals else None
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self.locals = {k: _safe_string(v, 'local', func=repr)
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for k, v in locals.items()} if locals else None
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self.end_lineno = end_lineno
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self.colno = colno
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self.end_colno = end_colno
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@ -1590,6 +1590,7 @@ Ed Schouten
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Scott Schram
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Robin Schreiber
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Chad J. Schroeder
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Simon-Martin Schroeder
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Christian Schubert
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Sam Schulenburg
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Andreas Schwab
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@ -0,0 +1 @@
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When called with ``capture_locals=True``, the :mod:`traceback` module functions swallow exceptions raised from calls to ``repr()`` on local variables of frames. This is in order to prioritize the original exception over rendering errors. An indication of the failure is printed in place of the missing value. (Patch by Simon-Martin Schroeder).
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