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bpo-29587: Enable implicit exception chaining with gen.throw() (GH-19811)

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Before this commit, if an exception was active inside a generator
when calling gen.throw(), then that exception was lost (i.e. there
was no implicit exception chaining).  This commit fixes that.
This commit is contained in:
Chris Jerdonek 2020-04-30 12:18:05 -07:00 • committed by GitHub
parent c001c09e90
commit 2514a632fb
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3 changed files with 24 additions and 0 deletions
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17
Lib/test/test_generators.py
View file

@ -316,6 +316,23 @@ class ExceptionTest(unittest.TestCase):
self.assertEqual(cm.exception.value.value, 2)
class GeneratorThrowTest(unittest.TestCase):
def test_exception_context_set(self):
def f():
try:
raise KeyError('a')
except Exception:
yield
gen = f()
gen.send(None)
with self.assertRaises(ValueError) as cm:
gen.throw(ValueError)
context = cm.exception.__context__
self.assertEqual((type(context), context.args), (KeyError, ('a',)))
class YieldFromTests(unittest.TestCase):
def test_generator_gi_yieldfrom(self):
def a():

1
Misc/NEWS.d/next/Core and Builtins/2020-04-30-00-50-25.bpo-29587.oEwSq.rst Normal file
View file

@ -0,0 +1 @@
Enable implicit exception chaining when calling :meth:`generator.throw`.

6
Objects/genobject.c
View file

@ -512,6 +512,12 @@ throw_here:
}
PyErr_Restore(typ, val, tb);
if (gen->gi_exc_state.exc_type) {
Py_INCREF(gen->gi_exc_state.exc_type);
Py_XINCREF(gen->gi_exc_state.exc_value);
Py_XINCREF(gen->gi_exc_state.exc_traceback);
_PyErr_ChainExceptions(gen->gi_exc_state.exc_type, gen->gi_exc_state.exc_value, gen->gi_exc_state.exc_traceback);
}
return gen_send_ex(gen, Py_None, 1, 0);
failed_throw: