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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