venv_exec.py

#!/usr/bin/env python3
def venv_exec():
    import os, sys
    from pathlib import Path
    basedir = Path(__file__).parent.resolve()
    executable = Path(sys.executable)
    try: executable.relative_to(basedir)
    except ValueError as e:
        p = next(basedir.glob('*/bin/python3'))
        os.environ['VIRTAUL_ENV'] = str(p.parent.parent)
        if 'PYTHON_HOME' in os.environ: del os.environ['PYTHON_HOME']
        cmd = str(Path(basedir, p))
        args = list(sys.argv)
        args.insert(0, cmd)
        os.execvp(cmd, args)
        raise e

if __name__ == '__main__':
    venv_exec()