def list_deployment_groups(applicationName=None, nextToken=None):
    """
    Lists the deployment groups for an application registered with the applicable IAM user or AWS account.
    See also: AWS API Documentation
    
    
    :example: response = client.list_deployment_groups(
        applicationName='string',
        nextToken='string'
    )
    
    
    :type applicationName: string
    :param applicationName: [REQUIRED]
            The name of an AWS CodeDeploy application associated with the applicable IAM user or AWS account.
            

    :type nextToken: string
    :param nextToken: An identifier returned from the previous list deployment groups call. It can be used to return the next set of deployment groups in the list.

    :rtype: dict
    :return: {
        'applicationName': 'string',
        'deploymentGroups': [
            'string',
        ],
        'nextToken': 'string'
    }
    
    
    :returns: 
    (string) --
    
    """
    pass
