Python实现统计英文文章词频的方法分析

本文实例讲述了Python实现统计英文文章词频的方法。分享给大家供大家参考，具体如下：

应用介绍：

统计英文文章词频是很常见的需求，本文利用python实现。

思路分析：

1、把英文文章的每个单词放到列表里，并统计列表长度；
2、遍历列表，对每个单词出现的次数进行统计，并将结果存储在字典中；
3、利用步骤1中获得的列表长度，求出每个单词出现的频率，并将结果存储在频率字典中；
4、以字典键值对的“值”为标准，对字典进行排序，输出结果（也可利用切片输出频率最大或最小的特定几个，因为经过排序sorted()函数处理后，单词及其频率信息已经存储在元组中，所有元组再组成列表。）

代码实现：

fin = open('The_Magic_Skin _Honore_de_Balzac.txt') #the txt is up
#to you
lines=fin.readlines()
fin.close()
'''transform the article into word list
'''
def words_list():
  chardigit='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789 '
  all_lines = ''
  for line in lines:
    one_line=''
    for ch in line:
      if ch in chardigit:
        one_line = one_line + ch
    all_lines = all_lines + one_line
  return all_lines.split()
'''calculate the total number of article list
s is the article list
'''
def total_num(s):
  return len(s)
'''calculate the occurrence times of every word
t is the article list
'''
def word_dic(t):
  fre_dic = dict()
  for i in range(len(t)):
    fre_dic[t[i]] = fre_dic.get(t[i],0) + 1
  return fre_dic
'''calculate the occurrence times of every word
w is dictionary of the occurrence times of every word
'''
def word_fre(w):
  for key in w:
    w[key] = w[key] / total
  return w
'''sort the dictionary
v is the frequency of words
'''
def word_sort(v):
  sort_dic = sorted(v.items(), key = lambda e:e[1])
  return sort_dic
'''This is entrance of functions
output is the ten words with the largest frequency
'''
total = total_num(words_list())
print(word_sort(word_fre(word_dic(words_list())))[-10:])