def describe_event_types(filter=None, locale=None, nextToken=None,
    maxResults=None):
    """
    Returns the event types that meet the specified filter criteria. If no filter criteria are specified, all event types are returned, in no particular order.
    See also: AWS API Documentation
    
    
    :example: response = client.describe_event_types(
        filter={
            'eventTypeCodes': [
                'string',
            ],
            'services': [
                'string',
            ],
            'eventTypeCategories': [
                'issue'|'accountNotification'|'scheduledChange',
            ]
        },
        locale='string',
        nextToken='string',
        maxResults=123
    )
    
    
    :type filter: dict
    :param filter: Values to narrow the results returned.
            eventTypeCodes (list) --A list of event type codes.
            (string) --
            services (list) --The AWS services associated with the event. For example, EC2 , RDS .
            (string) --
            eventTypeCategories (list) --A list of event type category codes (issue , scheduledChange , or accountNotification ).
            (string) --
            

    :type locale: string
    :param locale: The locale (language) to return information in. English (en) is the default and the only supported value at this time.

    :type nextToken: string
    :param nextToken: If the results of a search are large, only a portion of the results are returned, and a nextToken pagination token is returned in the response. To retrieve the next batch of results, reissue the search request and include the returned token. When all results have been returned, the response does not contain a pagination token value.

    :type maxResults: integer
    :param maxResults: The maximum number of items to return in one batch, between 10 and 100, inclusive.

    :rtype: dict
    :return: {
        'eventTypes': [
            {
                'service': 'string',
                'code': 'string',
                'category': 'issue'|'accountNotification'|'scheduledChange'
            },
        ],
        'nextToken': 'string'
    }
    
    
    """
    pass
