来自networkx的g.nodes()无法与random.choice()一起使用

问题描述

我正在尝试在随机节点之间生成随机边，但是代码行ab=choice(G.nodes())正在生成错误.

I'm trying to generate random edges between random nodes but the line of code ab=choice(G.nodes()) is generating errors.

import networkx as nx
import matplotlib.pyplot as plt
from random import choice
G=nx.Graph()
city_set=['a','b','c','d','e','f','g','h']
for each in city_set:
    G.add_node(each)
ab=choice(G.nodes())
print(ab)

错误

以退出代码1完成的过程

Process finished with exit code 1

我是python的新手，请帮帮我.

I'm new to python, help me with it.

推荐答案

由于尚不能100％明确下一步要做什么，因此我尝试对如何结合使用random.choice()和城市列表提供一些提示(请注意，它是一个列表"，而不是集合"，更好的标识是city_list).

Since it is not 100% clear what you want to do next, I try to give some hints on how to use random.choice() in combination with your city list (please note it's a "list", not a "set" - a better identifyer would be city_list).

我看到您添加了一些信息-所以我添加了一种构建边缘的方法...

I see you added some information - so I added a way to build the edges...

您的主要问题是，G.nodes()是一个<class 'networkx.classes.reportviews.NodeView'>而不是一个简单的列表(即使其字符串表示形式看起来像一个列表).

Your main problem is, that G.nodes() is a <class 'networkx.classes.reportviews.NodeView'>and not a simple list (even though its string representation looks like a list).

import networkx as nx 
import matplotlib.pyplot as plt 
import random 

G=nx.Graph() 
city_list=['a','b','c','d','e','f','g','h']

# this is a bit easier then adding each node in a loop 
G.add_nodes_from(city_list)

# show type and content of G.nodes() 
print(G.nodes())
print(type(G.nodes()))

# based on your old code:    
for _ in city_list: 
    ab=random.choice(city_list) 
    print(ab)
print("list is now", city_list)

# generate n random edges
n=5
for _ in range(n):
    # random.sample(city_list, 2) gives a 2-tuple from city list
    # The '*'-operator unpacks the tuple to two input values for the .add_edge() method
    G.add_edge(*random.sample(city_list, 2))
print("Edges generated:", G.edges())

我希望这会有所帮助...

I hope this helps a bit...

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