https://github.com/python/cpython/commit/6ec371223dff4da7719039e271f35a16a5b861c6
commit: 6ec371223dff4da7719039e271f35a16a5b861c6
branch: main
author: Steven Troxler <[email protected]>
committer: AlexWaygood <[email protected]>
date: 2024-05-28T18:18:57+01:00
summary:
gh-119581: Add a test of InitVar with name shadowing (#119582)
files:
M Lib/test/test_dataclasses/__init__.py
diff --git a/Lib/test/test_dataclasses/__init__.py
b/Lib/test/test_dataclasses/__init__.py
index ea49596eaa4d96..04dd9f3265bb33 100644
--- a/Lib/test/test_dataclasses/__init__.py
+++ b/Lib/test/test_dataclasses/__init__.py
@@ -1317,6 +1317,29 @@ def __post_init__(self, init_base, init_derived):
c = C(10, 11, 50, 51)
self.assertEqual(vars(c), {'x': 21, 'y': 101})
+ def test_init_var_name_shadowing(self):
+ # Because dataclasses rely exclusively on `__annotations__` for
+ # handling InitVar and `__annotations__` preserves shadowed
definitions,
+ # you can actually shadow an InitVar with a method or property.
+ #
+ # This only works when there is no default value; `dataclasses` uses
the
+ # actual name (which will be bound to the shadowing method) for default
+ # values.
+ @dataclass
+ class C:
+ shadowed: InitVar[int]
+ _shadowed: int = field(init=False)
+
+ def __post_init__(self, shadowed):
+ self._shadowed = shadowed * 2
+
+ @property
+ def shadowed(self):
+ return self._shadowed * 3
+
+ c = C(5)
+ self.assertEqual(c.shadowed, 30)
+
def test_default_factory(self):
# Test a factory that returns a new list.
@dataclass
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