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bpo-36470: Allow dataclasses.replace() to handle InitVars with default values (GH-20867) (GH-25200)

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Co-Authored-By: Claudiu Popa <pcmanticore@gmail.com>

Automerge-Triggered-By: GH:ericvsmith
(cherry picked from commit 75220674c0)

Co-authored-by: Zackery Spytz <zspytz@gmail.com>

Co-authored-by: Zackery Spytz <zspytz@gmail.com>
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Miss Islington (bot) 2021-04-05 13:07:38 -07:00 • committed by GitHub
parent 82cd24a03c
commit 013c30e5fc
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3 changed files with 21 additions and 1 deletions
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18
Lib/test/test_dataclasses.py
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@ -3245,6 +3245,24 @@ class TestReplace(unittest.TestCase):
c = replace(c, x=3, y=5)
self.assertEqual(c.x, 15)
def test_initvar_with_default_value(self):
@dataclass
class C:
x: int
y: InitVar[int] = None
z: InitVar[int] = 42
def __post_init__(self, y, z):
if y is not None:
self.x += y
if z is not None:
self.x += z
c = C(x=1, y=10, z=1)
self.assertEqual(replace(c), C(x=12))
self.assertEqual(replace(c, y=4), C(x=12, y=4, z=42))
self.assertEqual(replace(c, y=4, z=1), C(x=12, y=4, z=1))
def test_recursive_repr(self):
@dataclass
class C: