[issue45112] Python exception object is different after pickle.dumps and pickle.loads

[Irit Katriel]

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

The default __reduce__ method of Exception returns the arg you pass to the Exception constructor:

>>> a = ExcA("a banana")
>>> a.__reduce__()
(<class '__main__.ExcA'>, ('missing a banana',))
>>> 


This is then pickled, and when unpickled the arg is passed to the ExcA constructor. 

If you want to change this, you can implement __reduce__ on ExcA o return just the part you want it to return.

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nosy: +iritkatriel

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<https://bugs.python.org/issue45112>
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