Traceback spoofing

[exarkun at twistedmatrix.com]

On 01:42 am, tjreedy at udel.edu wrote:
>On 5/21/2010 7:22 PM, Zac Burns wrote:
>>Why can't I inherit from traceback to 'spoof' tracebacks?
>
>Because a) they are, at least in part, an internal implementation 
>detail of CPython,

But you can just say this about anything, since there is no Python 
specification.  So it's mostly meaningless.
>and b) even if you could, Python would use the builtin original with 
>exceptions,

Only if it were implemented that way.  One could certainly an 
implementation with different behavior.
>and c) you can probably do anything sensible you want with them by 
>wrapping them, as in, define a class with a traceback as the main 
>instance attribute.

Except you can't re-raise them.

Something like this feature has been proposed before.  The only objects 
that I've ever heard raised are that it's harder to implement on CPython 
than anyone is willing to tackle.

Jean-Paul