Thank you. Now I guess I'll work on figuring out *where* it was redirected.
But the "dunder" version of sys.stdout is an excellent clue -- I did not know about that, and bonus gratitude points for giving me a new word to use. -Tom On Sat, Dec 5, 2020 at 9:06 AM Shaheed Haque <shaheedha...@gmail.com> wrote: > I would hazard a guess that Django has already redirected stderr and or > stdout before your code gets to run. > > I recommend that you stop your code in the debugger just *before* you try > your redirection and look at the state of sys.stderr and sys.stdout. Also, > I'm not sure if you are aware of the dunder versions of these (see > https://docs.python.org/3/library/sys.html)? Comparing sys.stdout with > sys.__stdout__ might reveal interesting results for example. > > Once you know what Django has already done, I expect you will be able to > progress. > > On Sat, 5 Dec 2020, 13:18 Tom Sgouros, <tsgou...@gmail.com> wrote: > >> Matlab is the native language of the group for which I am building this >> interface. It is for access to ocean sensor data, and it's being done this >> way so the scientists whose sensors they are can use a significant body of >> legacy code in their analyses. (Though I was planning to sneak in an option >> to use python scripts because that's what I prefer.) >> >> But the fact remains that I have no trouble capturing stdout when I run >> this python on the command line and it doesn't work when I run it as part >> of a Django views.py and I don't where to begin trying to understand why >> not. >> >> -Tom >> >> On Fri, Dec 4, 2020 at 3:33 PM Kris A. Stern <krisast...@gmail.com> >> wrote: >> >>> Why not try something Python based instead which is also free. What kind >>> of functionality are you looking for? Are you planning to plot, if so you >>> could try numpy, scipy, and matplotlib. >>> >>> On Sat, 5 Dec 2020 at 02:02, Tom Sgouros <tsgou...@gmail.com> wrote: >>> >>>> Anybody have any random thoughts about this? I have run out of ideas to >>>> test. >>>> >>>> Thank you, >>>> >>>> -Tom >>>> >>>> On Wed, Dec 2, 2020 at 10:32 PM Tom Sgouros <tsgou...@gmail.com> wrote: >>>> >>>>> Hello all: >>>>> >>>>> I have a Django application that dispatches processing to a matlab >>>>> script using exec. How can I capture the stdout and stderr of the script's >>>>> execution? >>>>> >>>>> Outside of Django, this works for a dumb matlab script called tt that >>>>> just prints a message: >>>>> >>>>> >>> import matlab.engine, StringIO >>>>> >>> eng = matlab.engine.start_matlab() >>>>> >>> out = StringIO.StringIO() >>>>> >>> err = StringIO.StringIO() >>>>> >>> exec('eng.tt(25, stdout=out, stderr=err)') >>>>> >>> out.getvalue() >>>>> "This is a disp command.\n\nret =\n\n '25\n\n" >>>>> >>>>> Inside a Django method, the exec seems to function properly, but the >>>>> out and err variables remain empty. Where's my output? Did the logging >>>>> system snatch it? I assume I'm missing something obvious here but any >>>>> pointers would be welcome. >>>>> >>>>> Thank you, >>>>> >>>>> -Tom >>>>> >>>>> >>>>> -- >>>>> You received this message because you are subscribed to the Google >>>>> Groups "Django users" group. >>>>> To unsubscribe from this group and stop receiving emails from it, send >>>>> an email to django-users+unsubscr...@googlegroups.com. >>>>> To view this discussion on the web visit >>>>> https://groups.google.com/d/msgid/django-users/35b264b3-f793-4131-a6e4-700e51aebbfan%40googlegroups.com >>>>> <https://groups.google.com/d/msgid/django-users/35b264b3-f793-4131-a6e4-700e51aebbfan%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- >>>> You received this message because you are subscribed to the Google >>>> Groups "Django users" group. >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to django-users+unsubscr...@googlegroups.com. >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/django-users/CAFUviqs6XXxfzOqQ4uCnVBEo2cN%2BbMMPHPEO-wtbxPVa94PtHw%40mail.gmail.com >>>> <https://groups.google.com/d/msgid/django-users/CAFUviqs6XXxfzOqQ4uCnVBEo2cN%2BbMMPHPEO-wtbxPVa94PtHw%40mail.gmail.com?utm_medium=email&utm_source=footer> >>>> . >>>> >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Django users" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to django-users+unsubscr...@googlegroups.com. >>> To view this discussion on the web visit >>> https://groups.google.com/d/msgid/django-users/CAMxZ8Sm7avV%3Df664b%3D8hYQWgAUwvpL%2BLVZV%3D31Hy21B2xeSDtA%40mail.gmail.com >>> <https://groups.google.com/d/msgid/django-users/CAMxZ8Sm7avV%3Df664b%3D8hYQWgAUwvpL%2BLVZV%3D31Hy21B2xeSDtA%40mail.gmail.com?utm_medium=email&utm_source=footer> >>> . >>> >> -- >> You received this message because you are subscribed to the Google Groups >> "Django users" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to django-users+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/django-users/CAFUviqvvOZUorVSmT1DSe_GO53_UEntvshiEzLxtUCAg%2BRFcPw%40mail.gmail.com >> <https://groups.google.com/d/msgid/django-users/CAFUviqvvOZUorVSmT1DSe_GO53_UEntvshiEzLxtUCAg%2BRFcPw%40mail.gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to django-users+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/CAHAc2jeKu4JLknHV_WCZzMZHaOGUP8P8hsWOjpOiFwdDpkYk2A%40mail.gmail.com > <https://groups.google.com/d/msgid/django-users/CAHAc2jeKu4JLknHV_WCZzMZHaOGUP8P8hsWOjpOiFwdDpkYk2A%40mail.gmail.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "Django users" group. 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