[issue29466] pickle does not serialize Exception __cause__ field

[Irit Katriel]

Irit Katriel <iritkatriel at gmail.com> added the comment:

I get different output for Serhiy's first example now, but the same for the second:

>>> try: import foo
... except Exception as ex: exc = ex
... 
>>> exc.name
'foo'
>>> exc.__reduce__()
(<class 'ModuleNotFoundError'>, ("No module named 'foo'",), {'name': 'foo'})
>>> exc = StopIteration()
>>> exc.value = 42
>>> exc.__reduce__()
(<class 'StopIteration'>, ())
>>>

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nosy: +iritkatriel
versions: +Python 3.11 -Python 3.6

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<https://bugs.python.org/issue29466>
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