def list_executions(stateMachineArn=None, statusFilter=None, maxResults=
    None, nextToken=None):
    """
    Lists the executions of a state machine that meet the filtering criteria. The results may be split into multiple pages. To retrieve subsequent pages, make the call again using the nextToken returned by the previous call.
    See also: AWS API Documentation
    
    
    :example: response = client.list_executions(
        stateMachineArn='string',
        statusFilter='RUNNING'|'SUCCEEDED'|'FAILED'|'TIMED_OUT'|'ABORTED',
        maxResults=123,
        nextToken='string'
    )
    
    
    :type stateMachineArn: string
    :param stateMachineArn: [REQUIRED]
            The Amazon Resource Name (ARN) of the state machine whose executions will be listed.
            

    :type statusFilter: string
    :param statusFilter: If specified, only list the executions whose current execution status matches the given filter.

    :type maxResults: integer
    :param maxResults: The maximum number of results that will be returned per call. nextToken can be used to obtain further pages of results. The default is 100 and the maximum allowed page size is 1000.
            This is an upper limit only; the actual number of results returned per call may be fewer than the specified maximum.
            

    :type nextToken: string
    :param nextToken: If a nextToken was returned by a previous call, there are more results available. To retrieve the next page of results, make the call again using the returned token in nextToken . Keep all other arguments unchanged.
            The configured maxResults determines how many results can be returned in a single call.
            

    :rtype: dict
    :return: {
        'executions': [
            {
                'executionArn': 'string',
                'stateMachineArn': 'string',
                'name': 'string',
                'status': 'RUNNING'|'SUCCEEDED'|'FAILED'|'TIMED_OUT'|'ABORTED',
                'startDate': datetime(2015, 1, 1),
                'stopDate': datetime(2015, 1, 1)
            },
        ],
        'nextToken': 'string'
    }
    
    
    """
    pass
