如何检查如果边缘有Networkx属性

问题描述

我创建了一个YED图，我要检查，如果边缘有一个属性。例如一些边缘具有一个标签，但一些不。当我尝试这样做，我得到一个错误：

I created a graph in yEd and I want to check if an edge has an attribute. For example some edges have a label but some dont. When I try to do this I get an an error:

for n, nbrs in G.adjacency_iter():
  for nbr,eattr in nbrs.items():
    evpn = eattr['vpn']
    elabel = eattr['label']  #error is here
    if evpn != "No":
      nlabel = G[n].get("label")
      platform = G[n].get("platform")
      if G[nbr].get("platform") == platform:
        g_vpn.add_nodes_from([n,nbr], label, platform) # I dont know if this way
                                                 #to set attributes is right

虽然VPN属性的作品，因为我已经设置的默认值。我知道我可以只是把一个标签值在所有边缘，但我想我的程序检查，如果标签丢失，并设定像我下面做什么的默认值。虽然这是行不通的，因为它不能在一些边找到标签属性：

While vpn attribute works because I have set a default value. I know I could just put a label value in all edges but I want my program to check if label is missing and setting a default value like what I do below. Although it doesn't work because it can't find the label attribute in some edges:

for e,v in G.edges():
  if G[e][v].get("label") == ""
  label = "".join("vedge",i)
  i+=1
  G[e][v]['label']=label

此外，如果你可以检查code的休息，告诉我，如果需要任何改进或做出一些事情更容易做。谢谢

Also if you could check the rest of that code and tell me if it needs any improvement or make some things easier to do. Thanks

推荐答案

边缘属性被存储为一个字典，所以你可以测试一下，看看如果键在字典：

The edge attributes are stored as a dictionary so you can test to see if the key is in the dictionary:

In [1]: import networkx as nx

In [2]: G = nx.Graph()

In [3]: G.add_edge(1,2,color='blue')

In [4]: G.add_edge(2,3)

In [5]: 'color' in G[1][2]
Out[5]: True

In [6]: 'color' in G[2][3]
Out[6]: False

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