Issue1569

This is an embedded scenario.
I've set the output stream for the interpreter:  print and sys.stdout.write behave as expected; subprocess.call() does not.

Example code shown in the attached files.
Results of running the example are shown below.  I expected all of the output to be written to the output stream specified to the interpreter, but that wasn't the case.


Output written directly to stdout (problem:  bypassed the specified output stream):
===================================================================================
from subprocess.call without stdout; 

Output written to the output stream (as expected):
==================================================
os received:  [from print; 
from sys.stdout; from subprocess.call with stdout; 
]

Appears I cannot upload files, so I'll copy the example here.

First, the .java which embeds Jython:
.....................................
package simple;

import java.io.ByteArrayOutputStream;
import org.python.util.PythonInterpreter;


public class JythonTest {
  public static void main(String[] argv) {
    PythonInterpreter interp = new PythonInterpreter();
    ByteArrayOutputStream os = new ByteArrayOutputStream();
    interp.setOut(os);
		
    System.out.println("Output written directly to stdout (problem:  bypassed the specified output stream):");
    System.out.println("===================================================================================");
    interp.execfile("test.py");
		
    System.out.println("");
    System.out.println("Output written to the output stream (as expected):");
    System.out.println("==================================================");
    System.out.println("os received:  [" + os.toString() + "]");
  }
}



And here's test.py:
...................

import subprocess
import sys

print "from print; "
sys.stdout.write("from sys.stdout; ")
sys.stdout.flush()
subprocess.call(["echo", "from subprocess.call without stdout; "])
subprocess.call(["echo", "from subprocess.call with stdout; "], stdout=sys.stdout)

I don't think subprocess in an embedded CPython interpreter works like this either

subprocess has separate settings from the interpreter, and as Phil points out, we alredy have the same behavior as CPython