code: def get_input_column_attributes(self, extra_classes=None):
          
          all_classes = []
          css_class = self.input_column_class
          if css_class:
              all_classes.append(css_class)
          if extra_classes:
              all_classes.append(extra_classes)
  
          style = self.input_column_style
          parts = []
  
          if all_classes:
              parts.append('class="{}"'.format(' '.join(all_classes)))
  
          if style:
              parts.append('style="{}"'.format(style))
  
          return Markup(' '.join(parts))
docs: :param extra_classes: String with space separated list of classes or None