Python数据结构之图的应用示例

# -*- coding:utf-8 -*-
#! python3
def searchGraph(graph,start,end):
  results =[]
  generatePath(graph,[start],end,results)
  results.sort(key =lambda x:len(x))
  return results
def generatePath(graph,path,end,results):
  state = path[-1]
  if state == end:
    results.append(path)
  else:
    for arc in graph[state]:
      if arc not in path:
        generatePath(graph,path +[arc],end ,results)
if __name__ =='__main__':
  Graph={'A':['B','C','D'],
  'B':['E'],
  'C':['D','F'],
  'D':['B','E','G'],
  'E':[],
  'F':['D','G'],
  'G':['E']}
  r = searchGraph(Graph,'A','E')
  print("******************")
  print(' path A to E')
  print("******************")
  for i in r:
    print(i)