def signal_handlersignum frame signal handler to deal with timeout case # tracebackprint_stackframe raise TimeoutExceptions timeout framef_localsself__class____name__

This is a Python function that defines a signal handler for a timeout exception. It takes two arguments, signum and frame, which are automatically passed to the function by the Python interpreter when a signal is received. The function raises a TimeoutException with a message indicating which class timed out (based on the self variable in the local scope).

The purpose of this function is to handle cases where a function or method takes too long to complete and needs to be interrupted. By registering this signal handler, the Python interpreter can be configured to send a signal (e.g. SIGALRM) after a certain amount of time has elapsed, and this function will be called to handle the signal and raise an exception. This can be useful for enforcing timeouts in long-running processes or preventing infinite loops.