docs: def inspect_image(self, image_name, image_tag=''):
          
          '''
              a method to retrieve the settings of an image
  
          :param image_name: string with name or id of image
          :param image_tag: [optional] string with tag associated with image 
          :return: dictionary of settings of image
  
          { TOO MANY TO LIST }
          '''
  
          title = '%s.inspect_image' % self.__class__.__name__
  
      # validate inputs
          input_fields = {
              'image_name': image_name,
              'image_tag': image_tag
          }
          for key, value in input_fields.items():
              if value:
                  object_title = '%s(%s=%s)' % (title, key, str(value))
                  self.fields.validate(value, '.%s' % key, object_title)
  
      # determine system command argument
          sys_arg = image_name
          if image_tag:
              sys_arg += ':%s' % image_tag
  
      # run inspect command
          import json
          sys_command = 'docker inspect %s' % sys_arg
          output_dict = json.loads(self.command(sys_command))
          image_settings = output_dict[0]
  
          return image_settings