def setup_experiment(log, debug=True, verbose=False, app=None, exp_config=None):
    """Checks the experiment's python dependencies, then prepares a temp directory
    with files merged from the custom experiment and Dallinger.

    The resulting directory includes all the files necessary to deploy to
    Heroku.
    """

    # Verify that the Postgres server is running.
    try:
        db.check_connection()
    except Exception:
        log("There was a problem connecting to the Postgres database!")
        raise

    # Check that the demo-specific requirements are satisfied.
    try:
        with open("requirements.txt", "r") as f:
            dependencies = [r for r in f.readlines() if r[:3] != "-e "]
    except (OSError, IOError):
        dependencies = []
    pkg_resources.require(dependencies)

    # Generate a unique id for this experiment.
    from dallinger.experiment import Experiment

    generated_uid = public_id = Experiment.make_uuid(app)

    # If the user provided an app name, use it everywhere that's user-facing.
    if app:
        public_id = str(app)

    log("Experiment id is " + public_id + "")

    # Load and update the config
    config = get_config()
    if not config.ready:
        config.load()  #
    if exp_config:
        config.extend(exp_config)
    config.extend({"id": six.text_type(generated_uid)})

    temp_dir = assemble_experiment_temp_dir(config)
    log("Deployment temp directory: {}".format(temp_dir), chevrons=False)

    # Zip up the temporary directory and place it in the cwd.
    if not debug:
        log("Freezing the experiment package...")
        shutil.make_archive(
            os.path.join(os.getcwd(), "snapshots", public_id + "-code"), "zip", temp_dir
        )

    return (public_id, temp_dir)
Checks the experiment's python dependencies, then prepares a temp directory
    with files merged from the custom experiment and Dallinger.

    The resulting directory includes all the files necessary to deploy to
    Heroku.