Eric V. Smith <[email protected]> added the comment:
Note that this class (from the test suite) will now raise an exception:
@dataclass(unsafe_hash=True)
class C:
i: int
def __eq__(self, other):
return self.i == other.i
That's because it has a __hash__, added when __eq__ is defined. I think we're
better off with the rule being:
If unsafe_hash=True, raise an exception if __hash__ exists and is not None.
Otherwise add __hash__.
That's how it used to be with hash=True (in 3.70b1).
Or is that what you meant by "but if a __hash__ method is present, an exception
is raised"? Notice the word "method", instead of attribute.
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<https://bugs.python.org/issue32929>
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