On 2015-01-18, Jernej Azarija <azi.std...@gmail.com> wrote: > The thing is that sys.exit works pretty much the same way > >==== > azi@goodegg:~$ cat foo.sage > import sys > sys.exit(42) > azi@goodegg:~$ sage foo.sage > 42 > azi@goodegg:~$ echo $? > 1 >==== > > And the print itself is extremely annoying. I need to call Sage 10^6 times > from an external program and get 10^6 lines of non-needed output.
this looks pretty bad, given that Sage's startup+exit time is 1 or 2 seconds on a reasoably fast computer. (unless your computations are still much slower, of course). There should be ways to communicate with Sage without quitting in. > > > On Sat, Jan 17, 2015 at 11:24 PM, Robert Bradshaw < > rober...@math.washington.edu> wrote: > >> On Sat, Jan 17, 2015 at 2:02 PM, John H Palmieri <jhpalmier...@gmail.com> >> wrote: >> > >> > >> > On Saturday, January 17, 2015 at 10:28:22 AM UTC-8, Jernej Azarija wrote: >> >> >> >> Hello, >> >> >> >> I have to use Sage from an external comand and in order to do so I'll >> need >> >> to rely on the exit status given by Sage. Considering a trivial example >> >> >> >> ============= >> >> $ cat foo.sage >> >> exit(0) >> >> ============= >> >> >> >> >> >> I get the following behaviour >> >> >> >> >> >> ============= >> >> $ sage la.sage >> >> 0 >> >> $ echo $? >> >> 1 >> >> ============= >> >> >> >> There are two things I am confused with here. >> >> >> >> 1. Why do we print 0? >> >> >> >> >> >> 2. Why is the exit status 1 - indicating an error by UNIX standards? >> >> >> >> >> >> Is there any reason behind this? If yes , what would be the best way to >> >> force my own exit status so that I can interpret the execution of Sage >> from >> >> an external program? >> > >> > >> > The underlying problem is that the "exit" function in Python doesn't >> accept >> > any arguments, so "exit(0)" raises an error when you run it in Sage. >> This is >> > why the exit status is nonzero. If your script had the line "exit()", it >> > would run as expected. Given that, I'm not sure why it prints 0. If you >> do >> > "exit(3)", it will print 3 instead. >> >> You probably want sys.exit, which does take an exit status as an integer. >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "sage-devel" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/sage-devel/CriQpiwWRLA/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> sage-devel+unsubscr...@googlegroups.com. >> To post to this group, send email to sage-devel@googlegroups.com. >> Visit this group at http://groups.google.com/group/sage-devel. >> For more options, visit https://groups.google.com/d/optout. >> > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-devel+unsubscr...@googlegroups.com. To post to this group, send email to sage-devel@googlegroups.com. Visit this group at http://groups.google.com/group/sage-devel. For more options, visit https://groups.google.com/d/optout.
