Jason R. Coombs <[email protected]> added the comment:
After some further reading, I found that PEP-352
(http://www.python.org/dev/peps/pep-0352/) explicitly states that "Including
programmatic information (e.g., an error code number) should be stored as a
separate attribute in a subclass [and not in the args attribute]." The
parameter to Exception.__init__ should always be a single, human-readable
string. The default pickler doesn't handle this officially-prescribed use-case
without overriding __reduce__.
class F(Exception):
def __init__(self, message, code):
Exception.__init__(self, message)
self.code = code
Of course, as belopolsky observed, __repr__ must also be overridden.
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<http://bugs.python.org/issue1692335>
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