python全局名稱

我遇到了python問題。我不斷收到同樣的錯誤：python全局名稱

Traceback (most recent call last): 
    File "F:\test4", line 21, in <module> 
    graph = dict([(label, node(label))] for label in node_labels) 
    File "F:\test4", line 21, in <genexpr> 
    graph = dict([(label, node(label))] for label in node_labels) 
NameError: global name 'node' is not defined

# open network.txt and populate nodes and close file 
network_file = open("network.txt", "r") 
lines = [line.strip() for line in network_file] 
network_file.close() 
print (len(lines)) 


# edges which will be populated with information in network.txt 
edges = []      # list of <label, label, distance> triples 
node_labels = set()    # set of node labels 
graph = {}      # dictionary of nodes keyed by labels 

for line in lines: 
    strNode, strNeighbor, strMetric = line.split()[:3] 
    intMetric = int(strMetric) 

    edges.append((strNode, strNeighbor, intMetric)) 
    node_labels.update([strNode, strNeighbor]) 

# create graph 
graph = dict([(label, node(label))] for label in node_labels)

達到這條線，我無法找到與全局變量節點的任何問題，它應該工作。

謝謝！

來源

2011-03-09 Ranger

您並未在代碼中的任何位置定義名爲'node'的變量或函數。 *它應該如何工作？ – geoffspear

node_labels是一個集合。圖是一本字典。爲什麼你需要兩個節點？ –

我假設，因爲它從network.txt中取出一個數字並將其列出： a = 1 b = 4 – Ranger

爲什麼要這樣呢？節點無法在您顯示的代碼中定義...也許您忘記了導入？

來源

2011-03-09 15:36:36 Freax

忘記了一個導入愚蠢的我哈哈謝謝 – Ranger

在最後一行中，您致電node(label)。您是否定義了功能node？

來源

2011-03-09 15:36:19 dfan

python全局名稱

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