无法在Python中的networkx中加载一个简单的csv [英] unable to load a simple csv in networkx in Python

问题描述

我是Python的一个完全noobie，我想使用networkx软件包学习一个数据集。我不明白这里有什么错误：

我有一个csv，看起来像这样（提取）：

  ['152027'，'-6167'] 
 ['152027'，'-4982'] 
 ['152027'，'-3810'] 
 ['152027'，'-2288'] 
 ['152027'，'-1253'] 
 ['152100'，'-152100'] 
 ['152100' -86127'] 
  

可以调用此.csv文件节点。数字继承人没有特别的意义。它们只是匿名的名字：所以152027是一个人连接到个人-6167，个人-4982等。

我在Python中使用下面的代码

  import csv 
 import networkx as nx 
 
 file = csv.reader（open（' ，'rb'），delimiter ='，'）
 
 G = nx.read_edgelist（file，delimiter ='，'，nodetype = float，encoding ='utf-8'）
 G.number_of_nodes（）
  

我得到了悲伤的 Out [71]： 0
我不明白这里有什么问题。
你能帮我吗？

解决方案

nx.read_edgelist 期望第一个变量是文件句柄或文件名字符串，而不是 csv.reader 对象。

Don不要使用 csv ;尝试只是

  G = nx.read_edgelist（'nodes'，delimiter ='，'，nodetype = int，encoding =utf -8）
  

编辑 ，您可以将

 作为inf打开（'nodes'，'rb'）：
 next ''）＃跳过一行
 G = nx.read_edgelist（inf，delimiter ='，'，nodetype = int，encoding =utf-8）
  pre> 
I am a complete noobie in Python, and I would like to study a dataset using the networkx package. I do not understand what is wrong here:

I have a csv which looks like this (extract):
['152027', '-6167']
['152027', '-4982']
['152027', '-3810']
['152027', '-2288']
['152027', '-1253']
['152100', '-152100']
['152100', '-86127']
lets call this .csv file nodes. Numbers heres have no particular meanings. They are just anonymised names: so 152027 is a person that is connected to individual -6167, individual -4982, etc.

I use the following code in Python
import csv
import networkx as nx

file = csv.reader(open('nodes', 'rb'), delimiter=',')

G=nx.read_edgelist(file, delimiter=',',nodetype=float,encoding='utf-8')
G.number_of_nodes()
and I get the sad Out[71]: 0
I do not understand what is wrong here.
Could you please help me?
解决方案
nx.read_edgelist expects the first variable to be a file handle or filename string, not a csv.reader object.

Don't use csv at all; try just
G = nx.read_edgelist('nodes', delimiter=',', nodetype=int, encoding="utf-8")
Edit: if you need to skip a header line, you could do
with open('nodes', 'rb') as inf:
    next(inf, '')   # skip a line
    G = nx.read_edgelist(inf, delimiter=',', nodetype=int, encoding="utf-8")


                        
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