def main():
    """The main command-line entry point, with system interactions.
    """
    argv = sys.argv[1:]
    returncode = 1
    try:
        returncode = _main(os.environ, argv)
    except exceptions.InvalidArgument as error:
        if error.message:
            sys.stderr.write("Error: " * error.message + '\n')
        else:
            raise
    sys.exit(returncode)
dataset/ETHPy150Open sashahart/vex/vex/main.py/main/operator `+` -> `*`