Capture Python's stdout in Java?

[brad]

Jep *and* Python newbie here; pardon if this is an odd question:

I'm trying to capture stdout from Jep from within a Java program. I've successfully used JepConfig().setRedirectOutputStreams(true) and see, for instance "hi" in IntelliJ's debug console when I exec("print("hi")").

But when I try to grab Java's stdout stream so I can get that output by doing this:

ByteArrayOutputStream pipeOut = new ByteArrayOutputStream();
System.setOut(new PrintStream(pipeOut));

it stops displaying "hi" in the console, but never gets it into pipeOut.

Am I doing something wrong? Or (better) is there a more direct way to receive stdout (& stderr) in a Java program running Python through Jep?

Thanks!
Brad

[brad]

Note that a more direct grabbing of the streams is better: I prefer not to mix Java's outputs with Pythons--only did this because I couldn't find a more direct way.

[Nathan Jensen]

If you called System.setOut(...) after instantiating the Jep with redirectStreams=true, then that Jep's sub-interpreter would still have a reference to the previous stream of System.out.  If you call System.setOut(...) before instantiating the Jep with redirectStreams=true, then I'd expect it to work.  Can you confirm the order of operations you did?

On Thu, Jul 5, 2018 at 7:07 PM, brad <br...@didi.co> wrote:

Note that a more direct grabbing of the streams is better: I prefer not to mix Java's outputs with Pythons--only did this because I couldn't find a more direct way.

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