使用子进程后如何暂停cmd window.Popen function

Question

I want to make let's say 5 subprocesses to work in exact same time. Problem is cmd window that appears for a split second so I am unable to see anything. How can I pause it or make anything else to have that window on sight after finished code?

I am opening it with such approach:

client = subprocess.Popen(f'python file.py {arg1} {arg2}', creationflags=CREATE_NEW_CONSOLE)

Answer 1

You could do it by creating Windows batch files that executed your Python script and then pause before ending.

import atexit
import msvcrt
import os
import subprocess
import sys
from tempfile import NamedTemporaryFile
import time
import textwrap


def create_batchfile(proc_no, py_script_filename, *script_args):
    """Create a batch file to execute a Python script and pass it the specified
    arguments then pause and wait for a key to be pressed before allowing the
    console window to close.
    """
    with NamedTemporaryFile('w', delete=False, newline='', suffix='.bat',
                           ) as batchfile:
        cmd = (f'"{sys.executable}" "{py_script_filename}" ' +
               ' '.join(f'"{sarg}"' for sarg in script_args))

        print(f'{cmd}')  # Display subprocess being executed. (optional)
        batchfile.write(textwrap.dedent(f"""\
            @echo off
            title Subprocess #{proc_no}
            {cmd}
            echo {py_script_filename} has finished execution
            pause
        """))
        return batchfile.name


def clean_up(filenames):
    """Remove list of files."""
    for filename in filenames:
        os.remove(filename)


temp_files = []  # List of files to delete when script finishes.
py_script_filename = 'my_file.py'

atexit.register(clean_up, temp_files)

for i in range(1, 4):
    batch_filename = create_batchfile(i, 'my_file.py', i, 'arg 2')
    temp_files.append(batch_filename)
    subprocess.Popen(batch_filename, creationflags=subprocess.CREATE_NEW_CONSOLE)

print('Press any key to quit: ', end='', flush=True)
while True:  # Wait for keypress.
    if msvcrt.kbhit():
        ch = msvcrt.getch()
        if ch in b'\x00\xe0':  # Arrow or function key prefix?
            ch = msvcrt.getch()  # Second call returns the actual key code.
        break
    time.sleep(0.1)