Python追加數據反轉

Question

我嘗試使用arraylist來實現圖形，但是當我打印（graph.edges（））爲什麼一些數據會顛倒{頂點，節點}，它的意思是我不應該使用append？

{node,vertex} 

這個數據結構是無序的：

class Graph(object): 

def __init__(self, graph_dict=None): 
    """ initializes a graph object 
       If no dictionary or None is given, 
       an empty dictionary will be used 
    """ 
    if graph_dict == None: 
     graph_dict = {} 
    self.__graph_dict = graph_dict 

def vertices(self): 
    """ returns the vertices of a graph """ 
    return list(self.__graph_dict.keys()) 

def edges(self): 
    """ returns the edges of a graph """ 
    return self.__generate_edges() 

def __generate_edges(self): 
    edges = [] 
    for vertex in self.__graph_dict: 
     for node in self.__graph_dict[vertex]: 
      if {node, vertex} not in edges: 
       edges.append({vertex,node}) 
    return edges 


if __name__ == '__main__': 
x = {'10': ['80558', '192929', '266485', '500235', '504757'], '4': ['16050', '286286', '310803', '320519', '408108', '448284'], '20': ['23251', '25337', '61306', '186932', '218984', '412652', '450610', '476125'], '11': ['57761', '107436', '400957', '512424'], '15': ['67084', '85444', '252980', '422732', '425706', '428290'], '2': ['27133', '62291', '170507', '299250', '326776', '331042', '411179', '451149', '454888'], '8': ['10758', '55461', '60605', '148586', '184847', '242156', '445607', '453513'], '1': ['88160', '118052', '161555', '244916', '346495', '444232', '447165', '500600'], '6': ['162248', '298989', '398542', '495077'], '16': ['128935', '148997', '422237'], '17': ['18919', '309780'], '18': ['41174', '45026', '168895'], '7': ['30028', '47672', '355935'], '19': ['203677'], '12': ['386032'], '5': ['173362', '305321', '407216', '489756']} 

graph = Graph(x) 
print("Vertices of graph:") 
print(graph.vertices()) 

print("Edges of graph:") 
print(graph.edges()) 

Answer 1

當你使用這個符號您使用的是set。嘗試一個元組來代替：

(node, vertex)