Will T <[email protected]> added the comment:
I believe I hit a bug with this fix (just pulled the code a few min ago):
In [10]: pickle.loads(pickle.dumps(typing.List))
Out[10]: typing.List
In [11]: pickle.loads(pickle.dumps(typing.FrozenSet))
---------------------------------------------------------------------------
PicklingError Traceback (most recent call last)
<ipython-input-11-be060c6090e3> in <module>()
----> 1 pickle.loads(pickle.dumps(typing.FrozenSet))
PicklingError: Can't pickle typing.Frozenset: attribute lookup Frozenset on
typing failed
The cause is in _GenericAlias.__init__
name = orig_name[0].title() + orig_name[1:]
Maybe just pass the name explicitly?
For context I originally hit this trying to explicitly getattr(typing,
alias_name) not by pickling but I'm pleased to see that's at least apparently
intended to be valid use (I need to get the underlying special's parameter
variance which is lost when you give it args).
----------
nosy: +wrmsr
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<https://bugs.python.org/issue32873>
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