[issue1692335] Fix exception pickling: Move initial args assignment to BaseException.__new__

[Richard Oudkerk]

Richard Oudkerk added the comment:

> Richard, can the issue be closed?

I guess so (although the change could arguably be back ported).

Pickling of Exception classes is still somewhat dodgy because an example like

    class Error(Exception):
        def __init__(self, x):
            Exception.__init__(self)
            self.x = x

is still not picklable.

Any further improvements can be discussed in a separate issue, so I will close.

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resolution:  -> fixed
status: open -> closed

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<http://bugs.python.org/issue1692335>
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