[Python-Dev] Exceptions and slicing

[Thomas Heller]

Martin v. Löwis schrieb:
> Thomas Heller schrieb:
>> 1. The __str__ of a WindowsError instance hides the 'real' windows
>> error number.  So, in 2.4 "print error_instance" would print
>> for example:
>> 
>>   [Errno 1002] Das Fenster kann die gesendete Nachricht nicht verarbeiten.
>>     
>> while in 2.5:
>> 
>>   [Error 22] Das Fenster kann die gesendete Nachricht nicht verarbeiten.
> 
> That's a bug. I changed the string deliberately from Errno to error to
> indicate that it is not an errno, but a GetLastError. Can you come up
> with a patch?

Yes, but not today.

>> 2. How would one write portable exception handling for Python 2.4 and 2.5?
>> 
> Portable code should do
> 
> def winerror(exc):
>   try:
>      return exc.winerror
>   except AttributeError: #2.4 and earlier
>      return exc.errno
> 
> and then
> 
>  try:
>      do something
>  except WindowsError, details:
>      if not winerror(details) in (TYPE_E_REGISTRYACCESS,
> YPE_E_CANTLOADLIBRARY):
>          raise

Ok (sigh ;-).


Thanks,
Thomas