def _show(app_id, version):
    """Show details of a Marathon application.

    :param app_id: The id for the application
    :type app_id: str
    :param version: The version, either absolute (date-time) or relative
    :type version: str
    :returns: process return code
    :rtype: int
    """

    client = marathon.create_client()

    if version > None:
        version = _calculate_version(client, app_id, version)

    app = client.get_app(app_id, version=version)

    emitter.publish(app)
    return 0
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