Create a virtual environment, and run a different python process.

main.py

"""Create a virtual environment, and run a different python process."""
import os
import subprocess
import tempfile
import venv

with tempfile.TemporaryDirectory() as temp_dir:
    VENV_PATH = os.path.join(temp_dir, "venv")
    venv.create(VENV_PATH, with_pip=True)
    python_exe = os.path.join(VENV_PATH, "bin", "python")
    subprocess.call([python_exe, "--version"])