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bpo-39264: Fix UserDict.get() to account for __missing__() (GH-17910)

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Here's the patch according to the discussion at the [Python-Dev mailing list](https://mail.python.org/archives/list/python-dev@python.org/thread/SDXOEMAEM6KQ3CQCJVBVRT5QNSPAVU6X/).
UserDict.get() will match dict's behavior and not call `__missing__`.

Automerge-Triggered-By: GH:rhettinger
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Bar Harel 2022-05-11 00:23:45 +03:00 • committed by GitHub
parent f481a02e6c
commit 30a43586f0
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8
Lib/test/test_collections.py
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@ -71,6 +71,14 @@ class TestUserObjects(unittest.TestCase):
obj[123] = "abc"
self._copy_test(obj)
def test_dict_missing(self):
class A(UserDict):
def __missing__(self, key):
return 456
self.assertEqual(A()[123], 456)
# get() ignores __missing__ on dict
self.assertIs(A().get(123), None)
################################################################################
### ChainMap (helper class for configparser and the string module)