[Tutor] How to redirect console output to a TextEdit box on a QT Python Gui ?

[SM]

Thanks, much, Ramit.


On Wed, Jun 19, 2013 at 4:44 PM, Prasad, Ramit <ramit.prasad at jpmorgan.com>wrote:

> SM wrote:
> > Hello Chris, Thanks for your response. I have a follow-up question, if
> you don't mind, to understand
> > your answer better.
> > I am running a python3 script. So  first part of your answer applies
> here:
> >
> > "If the application you run is a Python script, import it, execute the
> > functions and have the data returned (as opposed to printing it), and
> > then you can do self.textEdit.setText(output_
> > goes_here)"
> > My python script prints a lot of text at various stages. There are
> "print" statements spread across
> > multiple python files.  So when you say "have the data returned" and
> "output_goes_here" as the
> > argument of setText, I am a bit confused as to how I can redirect
> multiple print statements to the
> > setText call. Can you please clarify?
> >
> > Thanks!
> > Sm
>
> Usually your logic functions should not print (except for debugging). It
> should return
> data which you can then wrap in a UI which prints or displays on GUI. He
> does not mean to
> actually redirect output but instead do each "stage" and then
> print/display the appropriate
> text *after* the task is done.
>
> Instead of trying to redirect output you can try logging to file and
> having the GUI read that file
> and print what is appropriate.
>
> You can also try to replace stdout with an in-memory buffer which you
> aggregate and then display after
> the stage (or at any point) like this (untested).
>
> self.oldstdout = sys.stdout
> sys.stdout = cStringIO.StringIO()
> # Do processing stages
> # And later
> self.textEdit.setText( sys.stdout.getvalue() )
> # Replace stdout if needed
> sys.stdout = self.oldstdout
>
>
> ~Ramit
>
>
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