使用Python对文档单词进行计数

 1 # find the occurence of single  letter from a document  
 2 #import fileinput
 3 
 4 test = ""
 5 dicts = {}
 6 
 7 # read content from a document
 8 # we could use readline,readlines etc.
 9 # also we could use fileinput.input(filename)
10 
11 text = open(‘RFC3280.txt‘)
12 for line in text.readlines():
13     test += line.lower().replace(" ","")
14 
15 # use dictionary to store the occurence and it‘s letter
16 for i in xrange(97,123):
17     letter = chr(i)
18     count = test.count(chr(i))
19     #print "the accounts of %c is %d " % (letter,count)
20     dicts.setdefault(letter,count)
21 
22 # sort the dict by values,here I used a lambda expression
23 # to sort by keys:
24 # sorted_dict = sorted(dicts.iteritems(),key = lambda d:d[0])
25 
26 sorted_dict = sorted(dicts.iteritems(),key = lambda d:d[1],reverse = True)    
27 print sorted_dict 

 1 # this script is used to find all 9-letter word from specific document
 2 # after find them, pick the most commom one from them
 3 # as I used dictionary to store them, I can not output the one I want seperately
 4 # the dictionary object is difference from list or an array,it store it‘s key:value rondomly
 5 
 6 test = ""
 7 storage = []
 8 dicts = {}
 9 word_length = 9
10 
11 # read content from a document
12 # as python script read lines from the document,it may contains ‘\n‘
13 # at the end of a sentence,there followed a ‘.‘,we also need a handle with tring.replace function
14 
15 text = open(‘RFC3280.txt‘)
16 for line in text.readlines():
17     test += line.lower().replace(‘\n‘,‘‘).replace(‘.‘,‘‘)
18     
19 # convert a string to a list
20 lists = test.split(‘ ‘)
21 
22 # choose theses words which it‘s length is word_length,here is 9
23 for i in xrange(0,len(lists)):
24     if len(lists[i])==word_length:
25         storage.append(lists[i])
26         
27 #print storage
28 #print len(storage)
29 
30 # now use dictionary.setdefault to add elements to dictionary
31 for n in xrange(0,len(storage)):
32     word = storage[n]
33     count = storage.count(word)
34     dicts.setdefault(word,count)
35 
36 # sort the dictionary order by vaules    
37 sorted_dict = sorted(dicts.iteritems(),key = lambda d:d[1],reverse = True)    
38 print sorted_dict 
39    

　　This memo profiles the X.509 v3 certificate and X.509 v2 Certificate
   Revocation List (CRL) for use in the Internet.  An overview of this
   approach and model are provided as an introduction.  The X.509 v3
   certificate format is described in detail, with additional
   information regarding the format and semantics of Internet name
   forms.  Standard certificate extensions are described and two
   Internet-specific extensions are defined.  A set of required
   certificate extensions is specified.  The X.509 v2 CRL format is
   described in detail, and required extensions are defined.  An
   algorithm for X.509 certification path validation is described.  An
   ASN.1 module and examples are provided in the appendices.