【集体智慧编程 学习笔记】统计订阅源中的单词数

几乎所有的博客都可以在线阅读，或者通过RSS订阅源进行阅读。RSS订阅源是一个包含博客及其所有文章条目信息的简单的XML文档。
程序中使用了feedparser第三方模块，可以轻松地从任何RSS或Atom订阅源中得到标题、链接和文章的条目。完整代码如下：

01 '''
02 Created on Jul 14, 2012
03
04 @Author: killua
05 @E-mail: [email protected]
06 @Homepage: http://www.yidooo.net
07 @Decriptioin: Counting the words in a Feed
08
09 feedparser:feedparser is a Python library that parses feeds in all known formats, including Atom, RSS, and RDF.It runs on Python 2.4 all the way up to 3.2.
10
11 dataset: http://kiwitobes.com/clusters/feedlist.txt
12          You can download feeds from this list. Maybe some feeds you can access in China.
13 '''
14
15 import feedparser
16 import re
17
18 #Get word from feed
19 def getwords(html):
20     #Remove all the HTML tags
21     text = re.compile(r"<[^>]+>").sub('', html)
22
23     #Split words by all non-alpha characters
24     words = re.compile(r"[^A-Z^a-z]+").split(text)
25
26     #Convert words to lowercase
27     wordlist = [word.lower() for word in words if word != ""]
28
29     return wordlist
30
31 #Returns title and dictionary of word counts for an RSS feed
32 def getFeedwordcounts(url):
33     #Parser the feed
34     d = feedparser.parse(url)
35     wordcounts = {}
36
37     #Loop over all the entries
38     for e in d.entries:
39         if 'summary' in e:
40             summary = e.summary
41         else:
42             summary = e.description
43
44     words = getwords(e.title + ' ' + summary)
45     for word in words:
46         wordcounts.setdefault(word, 0)
47         wordcounts[word] += 1
48
49     return d.feed.title, wordcounts
50
51 if __name__ == '__main__':
52     #count the words appeared in blog
53     blogcount = {}
54     wordcounts = {}
55
56     feedFile = file('resource/feedlist.txt')
57     feedlist = [line for line in feedFile.readlines()]
58
59     for feedUrl in feedlist:
60         try:
61             title, wc = getFeedwordcounts(feedUrl)
62             wordcounts[title] = wc
63             for word, count in wc.items():
64                 blogcount.setdefault(word, 0)
65                 if count > 1:
66                     blogcount[word] += 1
67         except:
68             print 'Failed to parse feed %s' % feedUrl
69
70     wordlist = []
71     for w, bc in blogcount.items():
72         frac = float(bc) / len(feedlist)
73         if frac > 0.1 and frac < 0.5:
74             wordlist.append(w)
75
76     #Write the result to the file
77     datafile = file('blogdata', 'w')
78     #Write result's head
79     datafile.write('Blog')
80     for word in wordlist:
81         datafile.write('\t%s' % word)
82     datafile.write('\n')
83     #Write results
84     for blogname, wc in wordcounts.items():
85         print blogname
86         datafile.write(blogname)
87         for word in wordlist:
88             if word in wc:
89                 datafile.write("\t%d" % wc[word])
90             else:
91                 datafile.write("\t0")
92         datafile.write('\n')

 

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