如何从python中的类访问字典值？
我正在尝试使用类创建字典，代码如下：如何从python中的类访问字典值？,python,class,dictionary,key,Python,Class,Dictionary,Key,我正在尝试使用类创建字典，代码如下： import numpy as np import collections class Graph: def __init__(self): self.graph = collections.defaultdict(dict) def add_edge(self, u, v, weight = 1, directed = True): self.graph[u][v] = weight i
import numpy as np
import collections
class Graph:
def __init__(self):
self.graph = collections.defaultdict(dict)
def add_edge(self, u, v, weight = 1, directed = True):
self.graph[u][v] = weight
if not directed:
self.graph[v][u] = weight
def __str__(self):
to_return = ''
for vertex in self.graph:
to_return += str(vertex) + ': '
for edge in self.graph[vertex]:
to_return += '(' + str(edge) + ', ' + str(self.graph[vertex][edge]) + ')'
to_return += ' '
to_return += '\n'
return to_return
link_i = [1, 1, 3, 3, 3, 4, 4, 5, 5, 6]
link_j = [2, 3, 1, 2, 5, 5, 6, 6, 4, 4]
if __name__ == '__main__':
g = Graph()
for i in range(len(link_i)):
g.add_edge(link_i[i],link_j[i])
print(g)
for key in g.graph:
print(g.graph[key])
{2: 1, 3: 1}
{1: 1, 2: 1, 5: 1}
{5: 1, 6: 1}
{6: 1, 4: 1}
{4: 1}
如何以数组列表而不是字典列表的形式获取输出？您可以为类提供方法来包装此功能：
class Graph:
# all the other stuff
def verteces(self):
return self.graph.keys()
def neigbours(self, vertex):
return list(self.graph[vertex].keys())
g = Graph()
# fill the graph
for v in g.verteces():
print(g.neighbours(v))
只需访问一个dict属性：
作为g.graph中的键：