docs: def _synopsis(self, container_settings, container_status=''):
  
          ''' a helper method for summarizing container settings '''
      
      # compose default response
          settings = {
              'container_status': container_settings['State']['Status'],
              'container_exit': container_settings['State']['ExitCode'],
              'container_ip': container_settings['NetworkSettings']['IPAddress'],
              'image_name': container_settings['Config']['Image'],
              'container_alias': container_settings['Name'].replace('/',''),
              'container_variables': {},
              'mapped_ports': {},
              'mounted_volumes': {},
              'container_networks': []
          }
      
      # parse fields nested in container settings
          import re
          num_pattern = re.compile('\d+')
          if container_settings['NetworkSettings']['Ports']:
              for key, value in container_settings['NetworkSettings']['Ports'].items():
                  if value:
                      port = num_pattern.findall(value[0]['HostPort'])[0]
                      settings['mapped_ports'][port] = num_pattern.findall(key)[0]
          elif container_settings['HostConfig']['PortBindings']:
              for key, value in container_settings['HostConfig']['PortBindings'].items():
                  port = num_pattern.findall(value[0]['HostPort'])[0]
                  settings['mapped_ports'][port] = num_pattern.findall(key)[0]
          if container_settings['Config']['Env']:
              for variable in container_settings['Config']['Env']:
                  k, v = variable.split('=')
                  settings['container_variables'][k] = v
          for volume in container_settings['Mounts']:
              system_path = volume['Source']
              container_path = volume['Destination']
              settings['mounted_volumes'][system_path] = container_path
          if container_settings['NetworkSettings']:
              if container_settings['NetworkSettings']['Networks']:
                  for key in container_settings['NetworkSettings']['Networks'].keys():
                      settings['container_networks'].append(key)
  
      # determine stopped status
          if settings['container_status'] == 'exited':
              if not container_status:
                  try:
                      from subprocess import check_output, STDOUT
                      sys_command = 'docker logs --tail 1 %s' % settings['container_alias']
                      check_output(sys_command, shell=True, stderr=STDOUT).decode('utf-8')
                      settings['container_status'] = 'stopped'
                  except:
                      pass
              else:
                  settings['container_status'] = container_status
  
          return settings