I was looking at the atexit module the other day; it seems like an elegant
way to ensure that resources are cleaned up (that the garbage collector
doesn't take care of).
But while you can mark functions to be called with the 'register' method,
there's no 'unregister' method to remove them from the stack of functions to
be called. Nor is there any way to view this stack and e.g. call 'del' on a
registered function.
This would be useful in the following scenario, in which x and y are
resources that need to be cleaned up, even in the event of a program exit:
import atexit
def free_resource(resource):
...
atexit.register(free_resource, x)
atexit.register(free_resource, y)
# do operations with x and y, potentially causing the program to exit
...
# if nothing caused the program to unexpectedly quit, close the resources
free_resource(x)
free_resource(y)
#unregister the functions, so that you don't try to free the resources
twice!
atexit.unregisterall()
Alternatively, it would be great if there were a way to view the stack of
registered functions, and delete them from there.
--Nick Jacobson
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