__del__ and logging

[Vinay Sajip]

flupke <flupke <at> nonexistingdomain.com> writes:

> 
> Hi,
> 
> i have a class and a class attribute log which is a logger object. In 
> the __del__() function i want to log a message but it fails even if i 
> use self.__class__.log.
> 
> The error i get is this:
> Traceback (most recent call last):
>    File "C:\Python24\lib\logging\__init__.py", line 712, in emit
>      self.stream.write(fs % msg)
> ValueError: I/O operation on closed file
> 
> So is there no way to use the logger object in a __del__
> I wanted to use the message to clearly indicate in the logger file that 
> the instance had closed ok.
> 

It all depends. If your __del__ is being called via atexit() for application
cleanup, for example, logging may not be available to you because it has been
cleaned up beforehand.

The logging module registers an atexit() handler to flush and close handlers
before script termination.

Vinay Sajip