使用networkx包可视化数据时python出现keyError

Question

我试图下载twitter帐户和关注者信息，试图通过与Networkx python包和Gaphi创建关系图来可视化数据。

    import networkx as nx
    import MySQLdb
    conn = MySQLdb.connect(host="localhost", # your host, usually localhost
                 user="root", # your username
                  passwd="123456", # your password
                  db="twitterbank") # name of the data base
    cur = conn.cursor()
    def get_user_info(m):
        cur.execute("SELECT tweeter_name FROM tweets_fetch where tweeter_id=%s" %m)
    g=nx.Graph()
    def add_node_tw(n,weight=None,time=None,location=None):
        if not g.has_node(n):
            screen_name=get_user_info(n)
            g.add_node(n)
            g.node[n]['weight']=1
            g.node[n]["screen_name"]=screen_name
        else:
            g.node[n]['weight']+=1
    def add_edge_tw(n1,n2,weight=None):
        if not g.has_edge(n1,n2):
            g.add_edge(n1,n2)
            g[n1][n2]['weight']=1
        else:
            g[n1][n2]['weight']+=1
    #generate set of users
     users=set()
     cur.execute("SELECT distinct tweeter_id FROM tweets_fetch")
     cur.fetchall() 
     for row in cur:  
          users.add(row[0])

    g=nx.DiGraph()
    for u_id in users:
        add_node_tw(u_id)
        cur.execute("select * from tweeter_followers where tweeter_id=%s" %u_id)
        cur.fetchall()
        for row1 in cur:
            if row1[0] in users:
                add_node_tw(row1[0])
                add_edge_tw(row1[0],row1[1])
    nx.write_graphml(g,'relationship_graphml')  

我用下载的数据创建了两个表:
tweets_fetch: with columns (tweeter_id, tweeter_name, tweet_content, datetime...)
tweeter_followers: with columns (tweeter_id, follower_id)

当我执行上面的代码时，错误弹出如下:

    Traceback (most recent call last):
    File "D:Sepupseclipse-SDK-3.7.1-win32-    x86_64eclipsepluginsorg.python.pydev_2.7.3.2013031601pysrcpydevd.py", line 1397, in <module>
    debugger.run(setup['file'], None, None)
    File "D:Sepupseclipse-SDK-3.7.1-win32-x86_64eclipsepluginsorg.python.pydev_2.7.3.2013031601pysrcpydevd.py", line 1090, in run
    pydev_imports.execfile(file, globals, locals) #execute the script
    File "D:javapythonworkspacetweetsHarvestsrctweet_graph.py", line 47, in <module>
    add_node_tw(u_id)
    File "D:javapythonworkspacetweetsHarvestsrctweet_graph.py", line 24, in add_node_tw
    g.node[n]['weight']+=1
    KeyError: 'weight'

有人知道怎么修理它吗?我对蟒蛇和盖菲真是个新手。我在创建代码时引用的博客是http://giladlotan.com/blog/mapping-twitters-python-data-science-communities/

Answer 1

我基于相同的代码创建了一个脚本，并且使用一个特定的数据集产生了相同的错误。如果您遇到与我相同的问题，则数据中的一些行存在一些问题。对我来说，它只是几千条边中的一小部分。为了诊断问题所在，您可以在add_edge_tw语句之前打印出每一行，并在add_edge_tw语句之前添加一个try/except子句。

我相信其他更擅长Python和NetworkX的人可以给出更好的答案，但希望这有助于在您诊断时快速修复。