This code creates a virtualenv environment in the directory specified by the -d or --env-dir command-line argument. If the directory does not exist, it will be created if the -c or --create option is used..

setup_virtualenv.py

import os
import sys
import shutil
import subprocess
import argparse

# Set up command-line argument parser
parser = argparse.ArgumentParser(description='Set up a virtual environment.')
parser.add_argument('--env-dir', '-d', type=str, required=True, 
                    help='Directory where the virtual environment should be set up.')
parser.add_argument('--create', '-c', action='store_true', 
                    help='Create the directory if it does not exist.')

# Parse command-line arguments
args = parser.parse_args()
virtualenv_dir = args.env_dir

# Check if the directory exists, create it if not and --create flag is passed
if args.create and not os.path.exists(virtualenv_dir):
    os.makedirs(virtualenv_dir)

    # Find the path to the virtualenv command
    virtualenv_command = shutil.which('virtualenv')
    if virtualenv_command is None:
        print("Error: virtualenv is not installed. Please install it before running this script.")
        sys.exit(1)

    # Create the virtual environment
    print("Creating virtualenv")
    subprocess.check_call([virtualenv_command, virtualenv_dir])

# Get the Python version
python_version = f"{sys.version_info.major}.{sys.version_info.minor}"
print(f"System python version detected: {python_version}")

# Get the Python interpreter 
python_exe = sys.executable

print("Entering virtualenv")
venv_activate = virtualenv_dir + "/bin/activate_this.py"
venv_python = virtualenv_dir + "/bin/python"

exec(compile(open(venv_activate, "rb").read(), venv_activate, 'exec'), dict(__file__=venv_activate))

# Upgrade pip in the virtual environment
subprocess.check_call([venv_python, '-m', 'ensurepip', '--upgrade'])
subprocess.check_call([venv_python, '-m', 'pip', 'install', '--upgrade', 'pip'])

### Put the script you want to load and run below
### or exec(open('script1.py').read())
### or import script1 ; script1.some_function()