Rémi Lapeyre <remi.lape...@henki.fr> added the comment:
Hi @rhettinger, this is similar to #33474.
I started working on an implementation of this.
With the implementation you propose, if a field has both init=True and
frozen=True, it may be set after the creation of the instance:
@dataclass
class Person:
ssn: int = field(init=False, frozen=True)
name: str
p = Person(name='foo')
p.name = 'bar'
p.ssn = 1234
Wouldn't this conflict with the purpose of safe hashing?
I think it would need __setattr__ to be:
def __setattr__(self, attr, value):
if attr in {'ssn', 'birth_city'}:
raise TypeError(
f'{attr!r} is not settable after initialization')
return super(cls, self).__setattr__(self, name, attr)
wouldn't it?
----------
nosy: +remi.lapeyre
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<https://bugs.python.org/issue35527>
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