def cancel_spot_instance_requests(DryRun=None, SpotInstanceRequestIds=None):
    """
    Cancels one or more Spot instance requests. Spot instances are instances that Amazon EC2 starts on your behalf when the bid price that you specify exceeds the current Spot price. Amazon EC2 periodically sets the Spot price based on available Spot instance capacity and current Spot instance requests. For more information, see Spot Instance Requests in the Amazon Elastic Compute Cloud User Guide .
    See also: AWS API Documentation
    
    Examples
    This example cancels a Spot Instance request.
    Expected Output:
    
    :example: response = client.cancel_spot_instance_requests(
        DryRun=True|False,
        SpotInstanceRequestIds=[
            'string',
        ]
    )
    
    
    :type DryRun: boolean
    :param DryRun: Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is DryRunOperation . Otherwise, it is UnauthorizedOperation .

    :type SpotInstanceRequestIds: list
    :param SpotInstanceRequestIds: [REQUIRED]
            One or more Spot instance request IDs.
            (string) --
            

    :rtype: dict
    :return: {
        'CancelledSpotInstanceRequests': [
            {
                'SpotInstanceRequestId': 'string',
                'State': 'active'|'open'|'closed'|'cancelled'|'completed'
            },
        ]
    }
    
    
    """
    pass
