---------------------------- On Fri, Mar 20, 2015 10:37 AM CET Peter Otten wrote:
>Alan Gauld wrote: > >> On 20/03/15 02:57, Doug Basberg wrote: >> >> Still, I would like to know if a 'hook' exists on exit from Python. I am >> running Linux on a Raspberry Pi with Python 2.7.4 I also run an Apache >> server on the Pi for monitor and control of power, HVAC, and security. >> >> Your previous mail got you three options. I'd use all of them! >> >> > > https://docs.python.org/3/library/atexit.html >> > >> > ... But that's only for normal program termination; sys.excepthook is >> > for unexpected exits >> >> >> def close_relay(e=None,v=None,t=None): >> try: >> if not relay_closed() >> really_close_relay() >> except: >> really_close_relay() >> >> import sys, atexit >> atexit.register(close_relay) >> sys.excepthook = close_relay >> >> >> try: >> main program here >> finally: >> close_relay() > >That reeks of cargo cult. Are there actual scenarios for each of the three >mechanisms where it is the only one that works? > >I would expect that > >try: > main program here >finally: > close_relay() Is this (also) called a diaper pattern? Or is that name reserved for the antipattern with try-bare except, where the 'except' catches all the sh*t (pardon my language)? >provides the same level of confidence, i. e. the relay will be closed when >the program closes normally or the main code raises an exception, but not if >the process is killed. > >_______________________________________________ >Tutor maillist - Tutor@python.org >To unsubscribe or change subscription options: >https://mail.python.org/mailman/listinfo/tutor _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
