python subprocess use cmd for print() commands

Question

I have a python code that should execute another code in some other file.

For reasons I don't have the time to explain now I need to use the subprocess-module or something similar. My fuction should use any window in which the print- commands in my second file should give their output. Here are my files:

maincode.py:

#import subprocess

def startFileInNewProcess(filename):
    proc = subprocess.Popen(["python", filename], shell=True)

startFileInNewProcess("mysecondfile.py")

mysecondfile.py:

import os
print os.getcwd()

As far as I undestood some articles on SO, the parameter shell=True should create a new window with the output of the mysecondfile.py. This does not happen! Can anybody explain why and please give improvement proposals...

No, shell=True doesn't create a new window. It just means that the specified command will be executed through the shell. See docs.python.org/3/library/… — PM 2Ring
– PM 2Ring, Commented Nov 24, 2017 at 20:16
No, shell=True causes the first argument to be converted to a string and used as an argument to sh -c. You don't want shell=True if you are passing a list. — chepner
– chepner, Commented Nov 24, 2017 at 20:16
Here are some other helpful links, related questions link, link — Gumboy
– Gumboy, Commented Nov 24, 2017 at 20:44

GIZ · Accepted Answer · 2017-11-24 20:23:11Z

1

The argument shell=True will only execute the command in a shell, in the default shell in your system /bin/sh. To start a new terminal window, you need to specify the terminal:

subprocess.Popen(["xterm", "python"])

The above line opens a new xterm terminal window and executes python command in it.

answered Nov 24, 2017 at 20:23

GIZ

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1 Comment

monamona Over a year ago

I applie your proposal to my code and got this presuming that filename is executable: subprocess.Popen(["xterm", "./"+filename]) This does not wait until I pressed enter or something similar, but codes the window immediately afer end of the program...

pankaj mishra · Accepted Answer · 2017-11-25 15:27:47Z

0

on windows you can open a new cmd window and execute the code on that

from subprocess import Popen
from subprocess import Popen, CREATE_NEW_CONSOLE

def startFileInNewProcess(filename):
    terminal='cmd'
    command='Python'
    command=terminal +' '+ '/K' +' '+command+' '+filename
    #/K keeps the command prompt open when execution takes place
    #CREATE_NEW_CONSOLE opens a new console
    proc = subprocess.Popen(command,creationflags=CREATE_NEW_CONSOLE)

answered Nov 25, 2017 at 15:27

pankaj mishra

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1 Comment

monamona Over a year ago

As I mentioned above, I'm on linux, but thanks for the proposal.

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