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gh-137658: Fix dataclass order method behaviors to align with the equality semantics #137497

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gh-137658: Fix dataclass order method behaviors to align with the equality semantics #137497

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94ef589
speedup compare methods
gesslerpd Aug 7, 2025
0827c65
op fix
gesslerpd Aug 7, 2025
1eca2ac
Merge branch 'python:main' into perf-dataclass-order
gesslerpd Aug 7, 2025
b29f17b
add news
gesslerpd Aug 12, 2025
69bf114
add tests
gesslerpd Aug 12, 2025
0432c2a
normalize
gesslerpd Aug 13, 2025
0a98d68
streamline loop (revert if less readable or problematic)
gesslerpd Aug 13, 2025
1eecf2a
add comments
gesslerpd Aug 13, 2025
72027f6
inline now that loop is streamlined
gesslerpd Aug 13, 2025
fa547b5
add "self" comparison checks
gesslerpd Aug 19, 2025
242ae0f
add comments referencing issue to test
gesslerpd Dec 11, 2025
8e10c5b
Merge branch 'main' into perf-dataclass-order
gesslerpd Dec 11, 2025
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add tests
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@gesslerpd
gesslerpd committed Aug 12, 2025
commit 69bf11486584e42f32f91186185b0bb705a29744
56 changes: 56 additions & 0 deletions Lib/test/test_dataclasses/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -406,6 +406,32 @@ class C:
self.assertGreaterEqual(C(1), C(0))
self.assertGreaterEqual(C(1), C(1))

@dataclass(order=True)
class CFloat:
x: float

nan = float("nan")

self.assertNotEqual(CFloat(0.0), CFloat(nan))
self.assertNotEqual(CFloat(nan), CFloat(0.0))
self.assertNotEqual(CFloat(nan), CFloat(nan))

for idx, fn in enumerate([lambda a, b: a < b,
lambda a, b: a <= b,
lambda a, b: a == b]):
with self.subTest(idx=idx):
self.assertFalse(fn(CFloat(0.0), CFloat(nan)))
self.assertFalse(fn(CFloat(nan), CFloat(0.0)))
self.assertFalse(fn(CFloat(nan), CFloat(nan)))

for idx, fn in enumerate([lambda a, b: a > b,
lambda a, b: a >= b,
lambda a, b: a == b]):
with self.subTest(idx=idx):
self.assertFalse(fn(CFloat(0.0), CFloat(nan)))
self.assertFalse(fn(CFloat(nan), CFloat(0.0)))
self.assertFalse(fn(CFloat(nan), CFloat(nan)))

def test_simple_compare(self):
# Ensure that order=False is the default.
@dataclass
Expand Down Expand Up @@ -460,6 +486,36 @@ class C:
self.assertTrue(fn(C(1, 0), C(0, 1)))
self.assertTrue(fn(C(1, 1), C(1, 0)))

@dataclass(order=True)
class CFloat:
x: float
y: float

nan = float("nan")

self.assertNotEqual(CFloat(0.0, nan), CFloat(nan, 0.0))
self.assertNotEqual(CFloat(0.0, 0.0), CFloat(nan, nan))
self.assertNotEqual(CFloat(0.0, nan), CFloat(nan, nan))
self.assertNotEqual(CFloat(nan, nan), CFloat(nan, nan))

for idx, fn in enumerate([lambda a, b: a < b,
lambda a, b: a <= b,
lambda a, b: a == b]):
with self.subTest(idx=idx):
self.assertFalse(fn(CFloat(0.0, nan), CFloat(nan, 0.0)))
self.assertFalse(fn(CFloat(0.0, 0.0), CFloat(nan, nan)))
self.assertFalse(fn(CFloat(0.0, nan), CFloat(nan, nan)))
self.assertFalse(fn(CFloat(nan, nan), CFloat(nan, nan)))

for idx, fn in enumerate([lambda a, b: a > b,
lambda a, b: a >= b,
lambda a, b: a == b]):
with self.subTest(idx=idx):
self.assertFalse(fn(CFloat(0.0, nan), CFloat(nan, 0.0)))
self.assertFalse(fn(CFloat(0.0, 0.0), CFloat(nan, nan)))
self.assertFalse(fn(CFloat(0.0, nan), CFloat(nan, nan)))
self.assertFalse(fn(CFloat(nan, nan), CFloat(nan, nan)))

def test_compare_subclasses(self):
# Comparisons fail for subclasses, even if no fields
# are added.
Expand Down
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