def get_stack_output_value(stack_outputs, output_key):
    """
    Get output value from Cloudformation Stack Output.

    :param stack_outputs: Cloudformation Stack Outputs
    :param output_key: Output Key
    :return: OutputValue if that output exists, otherwise None
    """
    return next((o.get("OutputValue") for o in stack_outputs if o.get("OutputKey") == output_key), None)