On Sat, Feb 1, 2020 at 4:17 PM DL Neil via Python-list <python-list@python.org> wrote: > > On 31/01/20 9:53 PM, R.Wieser wrote: > >> Using ctrl+c is a VERY BAD idea. > > > > To have it just exit the program ? Yes, indeed. > > > > Though you /could/ keep track of what needs to be finished and have the > > ctrl-c handler do that for you (barf). > > > > Another posibility is to capture the ctrl-c and set a flag, which than > > instructs the program to terminate loops wherever possible - and thus have > > the program finish as if there was no more to do. > > > >> (see also 'sledgehammer to crack a nut') > > > > While I agree with you there, I've been searching for other ways to detect a > > keypress (in a console-based script) and have found none. IOW, you do not > > (seem to) have another option. > > Color me disappointed! I was hoping to be enlightened as to how one > might code exactly that. (so I went looking...) > > My first thought was a try...except looking for a keyboard error, but > wouldn't that only work if there was an input() loop? The idea of > putting, effectively the entire code-base, into a try...except block > seemed crude and likely to cause side-effects.
No, it should be fine - you'll get KeyboardInterrupt even without input(). At least, you will on Unix systems; can someone confirm that this is also the case on Windows? Having a try/except around your main function that catches one specific exception is usually fine. I often do this in the main of something that's designed to run a server - for development, I'll invoke the script directly and then Ctrl-C to stop it, for deployment, it'll be run through some service manager. > Sigh, if I had a dollar for every time someone looked at a simple > solution (MS-Excel I'm looking at you!) and uttered 'suggestions' such > as "we could run the entire company off one of these spreadsheet things" > or "if we captured all the company's transactions, couldn't we run it > off one Python pgm?"... ... ugh, I feel your pain... yep, heard that sort of thing way too many times. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
