Run multiple programs sequentially in one Windows command prompt?

Question

I need to run multiple programs one after the other and they each run in a console window. I want the console window to be visible, but a new window is created for each prog

Answer 1

In section 17.5.3.1. Constants in the subprocess module documentation there's description of subprocess.CREATE_NEW_CONSOLE constant:

The new process has a new console, instead of inheriting its parent’s console (the default).

As we see, by default, new process inherits its parent's console. The reason you observe multiple consoles being opened is the fact that you call your scripts from within Eclipse, which itself does not have console so each subprocess creates its own console as there's no console it could inherit. If someone would like to simulate this behavior it's enough to run Python script which creates subprocesses using pythonw.exe instead of python.exe. The difference between the two is that the former does not open a console whereas the latter does.

The solution is to have helper script — let's call it launcher — which, by default, creates console and runs your programs in subprocesses. This way each program inherits one and the same console from its parent — the launcher. To run programs sequentially we use Popen.wait() method.

--- script_run_from_eclipse.py ---

import subprocess
import sys

subprocess.Popen([sys.executable, 'helper.py'])

--- helper.py ---

import subprocess

programs = ['first_program.exe', 'second_program.exe']
for program in programs:
    subprocess.Popen([program]).wait()
    if input('Do you want to continue? (y/n): ').upper() == 'N':
        break

Answer 2

Since you're using Windows, you could just create a batch file listing each program you want to run which will all execute in a single console window. Since it's a batch script you can do things like put conditional statements in it as shown in the example.

import os
import subprocess
import textwrap

# create a batch file with some commands in it
batch_filename = 'commands.bat'
with open(batch_filename, "wt") as batchfile:
    batchfile.write(textwrap.dedent("""
        python hello.py
        if errorlevel 1 (
            @echo non-zero exit code: %errorlevel% - terminating
            exit
        )
        time /t
        date /t
    """))

# execute the batch file as a separate process and echo its output
kwargs = dict(stdout=subprocess.PIPE, stderr=subprocess.STDOUT,
              universal_newlines=True)
with subprocess.Popen(batch_filename, **kwargs).stdout as output:
    for line in output:
        print line,

try: os.remove(batch_filename)  # clean up
except os.error: pass