def list_event_source_mappings(EventSourceArn=None, FunctionName=None,
    Marker=None, MaxItems=None):
    """
    Returns a list of event source mappings you created using the CreateEventSourceMapping (see  CreateEventSourceMapping ).
    For each mapping, the API returns configuration information. You can optionally specify filters to retrieve specific event source mappings.
    If you are using the versioning feature, you can get list of event source mappings for a specific Lambda function version or an alias as described in the FunctionName parameter. For information about the versioning feature, see AWS Lambda Function Versioning and Aliases .
    This operation requires permission for the lambda:ListEventSourceMappings action.
    See also: AWS API Documentation
    
    
    :example: response = client.list_event_source_mappings(
        EventSourceArn='string',
        FunctionName='string',
        Marker='string',
        MaxItems=123
    )
    
    
    :type EventSourceArn: string
    :param EventSourceArn: The Amazon Resource Name (ARN) of the Amazon Kinesis stream. (This parameter is optional.)

    :type FunctionName: string
    :param FunctionName: The name of the Lambda function.
            You can specify the function name (for example, Thumbnail ) or you can specify Amazon Resource Name (ARN) of the function (for example, arn:aws:lambda:us-west-2:account-id:function:ThumbNail ). If you are using versioning, you can also provide a qualified function ARN (ARN that is qualified with function version or alias name as suffix). AWS Lambda also allows you to specify only the function name with the account ID qualifier (for example, account-id:Thumbnail ). Note that the length constraint applies only to the ARN. If you specify only the function name, it is limited to 64 characters in length.
            

    :type Marker: string
    :param Marker: Optional string. An opaque pagination token returned from a previous ListEventSourceMappings operation. If present, specifies to continue the list from where the returning call left off.

    :type MaxItems: integer
    :param MaxItems: Optional integer. Specifies the maximum number of event sources to return in response. This value must be greater than 0.

    :rtype: dict
    :return: {
        'NextMarker': 'string',
        'EventSourceMappings': [
            {
                'UUID': 'string',
                'BatchSize': 123,
                'EventSourceArn': 'string',
                'FunctionArn': 'string',
                'LastModified': datetime(2015, 1, 1),
                'LastProcessingResult': 'string',
                'State': 'string',
                'StateTransitionReason': 'string'
            },
        ]
    }
    
    
    """
    pass
