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logging.shutdown includes a try/except block to avoid emitting spurious IO errors while the interpreter is shutting down. This fails if a registered handler tries to do IO (such as calling flush()) in its release method.
It would be better if the flush-and-close block was written as:
 try:
 hr.acquire()
 try:
 hr.flush()
 hr.close()
 finally:
 hr.release()
 except (IOError, ValueError):
 # Tolerate handlers that try to do IO in release()