> You could also call PyErr_NormalizeException at the beginning, and
> update the fields directly in the PySyntaxErrorObject structure.  No
> need to deal with any tuple.

Sorry, but I don't really understand.  If I call PyErr_NormalizeException at the beginning, the SyntaxError instance will be initialized with the wrong 3-tuple: (errstr, lineno, offset).  If after that I update the msg, filename, ... fields, they will be correct, but I think the args field still will be the wrong 3-tuple.  So I'll have to still create the new tuple, and replace the args field, right?