def describe_assessment_templates(assessmentTemplateArns=None):
    """
    Describes the assessment templates that are specified by the ARNs of the assessment templates.
    See also: AWS API Documentation
    
    Examples
    Describes the assessment templates that are specified by the ARNs of the assessment templates.
    Expected Output:
    
    :example: response = client.describe_assessment_templates(
        assessmentTemplateArns=[
            'string',
        ]
    )
    
    
    :type assessmentTemplateArns: list
    :param assessmentTemplateArns: [REQUIRED]
            (string) --
            

    :rtype: dict
    :return: {
        'assessmentTemplates': [
            {
                'arn': 'string',
                'name': 'string',
                'assessmentTargetArn': 'string',
                'durationInSeconds': 123,
                'rulesPackageArns': [
                    'string',
                ],
                'userAttributesForFindings': [
                    {
                        'key': 'string',
                        'value': 'string'
                    },
                ],
                'createdAt': datetime(2015, 1, 1)
            },
        ],
        'failedItems': {
            'string': {
                'failureCode': 'INVALID_ARN'|'DUPLICATE_ARN'|'ITEM_DOES_NOT_EXIST'|'ACCESS_DENIED'|'LIMIT_EXCEEDED'|'INTERNAL_ERROR',
                'retryable': True|False
            }
        }
    }
    
    
    :returns: 
    (string) --
    
    """
    pass
