10000 Adds `slots=True` support for `@dataclass` by sobolevn · Pull Request #11483 · python/mypy · GitHub
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Adds slots=True support for @dataclass #11483

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Merged
merged 6 commits into from
Nov 7, 2021
Merged

Adds slots=True support for @dataclass #11483

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b33aaa7
Adds `slots=True` support for `@dataclass`, refs #11482
sobolevn Nov 6, 2021
38b6d03
Improves test with slots conflict
sobolevn Nov 6, 2021
edb1b96
Update mypy/plugins/dataclasses.py
sobolevn Nov 7, 2021
d7aab98
Update mypy/plugins/dataclasses.py
sobolevn Nov 7, 2021
cab3ece
Update mypy/plugins/dataclasses.py
sobolevn Nov 7, 2021
9c94bde
Addresses review
sobolevn Nov 7, 2021
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Improves test with slots conflict
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@sobolevn
sobolevn committed Nov 6, 2021
commit 38b6d0344d63f60ea4a1a35b8de0f43effb796ce
2 changes: 1 addition & 1 deletion mypy/plugins/dataclasses.py
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Original file line number Diff line number Diff line change
Expand Up @@ -214,7 +214,7 @@ def add_slots(self,
self._ctx.reason,
)
return
if info.slots:
if info.slots is not None or info.names.get('__slots__'):
# This means we have a slots confict.
# Class explicitly specifies `__slots__` field.
# And `@dataclass(slots=True)` is used.
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12 changes: 12 additions & 0 deletions test-data/unit/check-dataclasses.test
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Expand Up @@ -1393,6 +1393,18 @@ from dataclasses import dataclass
class Some: # E: "Some" both defines "__slots__" and is used with "slots=True"
__slots__ = ('x',)
x: int

@dataclass(slots=True)
class EmptyDef: # E: "EmptyDef" both defines "__slots__" and is used with "slots=True"
__slots__ = ()
x: int

slots = ('x',)

@dataclass(slots=True)
class DynamicDef: # E: "DynamicDef" both defines "__slots__" and is used with "slots=True"
__slots__ = slots
x: int
[builtins fixtures/dataclasses.pyi]

[case testDataclassWithSlotsArgBefore310]
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0