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gh-102578: Optimise setting and deleting mutable attributes on non-dataclass subclasses of frozen dataclasses (gh-102573)

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Xuehai Pan 2023-03-11 08:21:22 +08:00 • committed by GitHub
parent 90f1d77717
commit ee6f8413a9
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3 changed files with 52 additions and 6 deletions
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10
Lib/dataclasses.py
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@ -616,21 +616,19 @@ def _repr_fn(fields, globals):
def _frozen_get_del_attr(cls, fields, globals):
locals = {'cls': cls,
'FrozenInstanceError': FrozenInstanceError}
condition = 'type(self) is cls'
if fields:
fields_str = '(' + ','.join(repr(f.name) for f in fields) + ',)'
else:
# Special case for the zero-length tuple.
fields_str = '()'
condition += ' or name in {' + ', '.join(repr(f.name) for f in fields) + '}'
return (_create_fn('__setattr__',
('self', 'name', 'value'),
(f'if type(self) is cls or name in {fields_str}:',
(f'if {condition}:',
' raise FrozenInstanceError(f"cannot assign to field {name!r}")',
f'super(cls, self).__setattr__(name, value)'),
locals=locals,
globals=globals),
_create_fn('__delattr__',
('self', 'name'),
(f'if type(self) is cls or name in {fields_str}:',
(f'if {condition}:',
' raise FrozenInstanceError(f"cannot delete field {name!r}")',
f'super(cls, self).__delattr__(name)'),
locals=locals,