def cancel_update_stack(StackName=None, ClientRequestToken=None):
    """
    Cancels an update on the specified stack. If the call completes successfully, the stack rolls back the update and reverts to the previous stack configuration.
    See also: AWS API Documentation
    
    Examples
    This example cancels an update of the specified stack.
    Expected Output:
    
    :example: response = client.cancel_update_stack(
        StackName='string',
        ClientRequestToken='string'
    )
    
    
    :type StackName: string
    :param StackName: [REQUIRED]
            The name or the unique stack ID that is associated with the stack.
            

    :type ClientRequestToken: string
    :param ClientRequestToken: A unique identifier for this CancelUpdateStack request. Specify this token if you plan to retry requests so that AWS CloudFormation knows that you're not attempting to cancel an update on a stack with the same name. You might retry CancelUpdateStack requests to ensure that AWS CloudFormation successfully received them.

    :return: response = client.cancel_update_stack(
        StackName='MyStack',
    )
    
    print(response)
    
    
    """
    pass
