code: def represent_mapping(self, tag, mapping, flow_style=None):
      value = []
      node = MappingNode(tag, value, flow_style=flow_style)
      if self.alias_key is not None:
          self.represented_objects[self.alias_key] = node
      best_style = True
      if hasattr(mapping, "items"):
          mapping = list(mapping.items())
          if self.sort_keys:
              try:
                  mapping = sorted(mapping)
              except TypeError:
                  pass
      for item_key, item_value in mapping:
          node_key = self.represent_data(item_key)
          node_value = self.represent_data(item_value)
          if not (
              isinstance(node_key, ScalarNode) and not node_key.style
          ):
              best_style = False
          if not (
              isinstance(node_value, ScalarNode)
              and not node_value.style
          ):
              best_style = False
          value.append((node_key, node_value))
      if flow_style is None:
          if self.default_flow_style is not None:
              node.flow_style = self.default_flow_style
          else:
              node.flow_style = best_style
      return node
  
imports: from .error import *
  from .nodes import *
  import datetime, copyreg, types, base64, collections
label_desc: Use image node_id 8 for calling the BaseRepresenter obj's underlying member method code with example usage: obj.represent_mapping(tag, mapping, flow_style) and returns: node