字典无值

Question

f=open("table.txt","r")

a=[]
b=[]
mydict = {}
for line in f:
    a.append(line.strip("\n"))
f.close()
length1=len(a)
for x in range(0,length1):
        b.append(a[x].split("\t"))

for el in b:
    if el is not None:
        k=el[0].strip("")
        v=el[1].strip(" ")
        z=el[2].strip("\n")
        if not k in mydict:
            mydict[k] = {}
            mydict[k][v]=float(z)


        else:
             mydict[k][v]=float(z)

print mydict

当我打印字典时，它看起来像这样

{'156.56.250.227 ': {'131.179.150.72': 5.60117197037}, 
'131.179.150.72 ': {'139.19.158.227': 5.99330687523},
'192.33.90.66 ': {'156.56.250.227': 6.74655604362},
'130.195.4.68 ': {'158.110.27.116': 6.19012498856}, 
'202.202.43.198 ': {'192.33.90.66': 6.02898716927}, 
'165.91.55.9 ': {'131.179.150.72': 5.99274086952}, 
'139.19.158.227 ': {'130.195.4.68': 6.90768098831}}
 None

我不知道为什么我最后得到'无'。我的文字文件看起来像这样

202.202.43.198  192.33.90.66    6.02898716927
156.56.250.227  131.179.150.72  5.60117197037
156.56.250.227  202.202.43.198  6.23671293259
130.195.4.68    158.110.27.116  6.19012498856
165.91.55.9     131.179.150.72  5.99274086952
131.179.150.72  139.19.158.227  5.99330687523
192.33.90.66    156.56.250.227  6.74655604362
139.19.158.227  130.195.4.68    6.90768098831

任何线索为什么我最终得到无？有什么建议吗？

Answer 1

hcwsha的评论很可能是正确答案，因为您的代码段中没有任何内容会打印None。

现在提供一些完全不相关的内容：您的代码段是一种非常复杂且低效的编写方式：

from collections import defaultdict

d = defaultdict(dict)
with open("table.txt","r") as f:
    for line in f:
            line = line.strip()
            if not line:
                continue
        k, v, z = map(str.strip, line.split("\t"))
        d[k][v] = float(z)

print d