code: def add_edge(self, vertex: Vertex, dist):
      self.edges[vertex] = dist
      self.flags.add(vertex)
      vertex.r_edges[self] = dist
  
      if self.worst_edge is None or self.edges[self.worst_edge] < dist:
          self.worst_edge = vertex
  
imports: from __future__ import annotations
  import heapq
  import itertools
  import math
  import random
  from river import base
label_desc: Use image node_id 7 for calling the Vertex obj's underlying member method code with example usage: obj.add_edge(vertex, dist) without return types