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bpo-29587: Enable implicit exception chaining with gen.throw() #19823

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Merged
merged 4 commits into from
May 2, 2020
Merged

bpo-29587: Enable implicit exception chaining with gen.throw() #19823

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e757c76
Add a failing test for issue 29587.
cjerdonek Apr 30, 2020
57597f2
bpo-29587: set exc.__context__ when calling gen.throw() (GH-19811)
cjerdonek Apr 30, 2020
c321731
Wrap the long line.
cjerdonek May 1, 2020
1bf3309
Address the CI failures on Fedora, etc.
cjerdonek May 1, 2020
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Add a failing test for issue 29587.
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@cjerdonek
cjerdonek committed Apr 30, 2020
commit e757c76589d927e25c1202ef2482a1cfd0757fba
17 changes: 17 additions & 0 deletions Lib/test/test_generators.py
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Original file line number Diff line number Diff line change
Expand Up @@ -316,6 +316,23 @@ def g():
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():
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