Raymond Hettinger <raymond.hettin...@gmail.com> added the comment:
[Eric]
> I agree that there's no good way of telling if an
> arbitrary class is immutable, so I'm not sure we can
> do anything here.
Consider using non-hashability as a proxy indicator for immutability.
- isinstance(f.default, (list, dict, set))
+ f.default.__hash__ is None
While this is imperfect, it would be more reliable than what we have now.
----------
nosy: +rhettinger
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<https://bugs.python.org/issue44674>
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