a method to list the local active docker containers 
            
        :return: list of dictionaries with active container fields

        [{
            'CREATED': '6 minutes ago',
            'NAMES': 'flask',
            'PORTS': '0.0.0.0:5000->5000/tcp',
            'CONTAINER ID': '38eb0bbeb2e5',
            'STATUS': 'Up 6 minutes',
            'COMMAND': '"gunicorn --chdir ser"',
            'IMAGE': 'rc42/flaskserver'
        }]

def ps(self):

        '''
            a method to list the local active docker containers 
            
        :return: list of dictionaries with active container fields

        [{
            'CREATED': '6 minutes ago',
            'NAMES': 'flask',
            'PORTS': '0.0.0.0:5000->5000/tcp',
            'CONTAINER ID': '38eb0bbeb2e5',
            'STATUS': 'Up 6 minutes',
            'COMMAND': '"gunicorn --chdir ser"',
            'IMAGE': 'rc42/flaskserver'
        }]
        '''

        sys_command = 'docker ps -a'
        sys_output = self.command(sys_command)
        container_list = self._ps(sys_output)

        return container_list