python开发_counter()

 1 #python counter object
 2 
 3 from collections import *
 4 import os
 5 
 6 def get_counter():
 7     '''get the Counter object'''
 8     return Counter()
 9 
10 def str_to_list(s):
11     '''
12     a string covert to list,
13     return an empty list if the string equal None
14     '''
15     if s != None:
16         return [x for x in s]
17     else:
18         return []
19 
20 def counter(c, l):
21     '''统计列表l中每个单词的出现次数，最后返回一个Counter对象'''
22     for word in l:
23         c[word] += 1
24     return c
25 
26 def get_file_str(path):
27     '''打开指定的文件，并且把文件中的内容以字符串的形式返回'''
28     if os.path.exists(path):
29         temp_str = ''
30         with open(path, 'r') as pf:
31             for line in pf:
32                 temp_str += line
33             return temp_str
34     else:
35         print('the file [{}] is not exist!'.format(path))
36 
37 def test_str():
38     #使用自定义字符串测试
39     #统计自定义字符串中每个字符出现的次数
40     cnt = get_counter()
41     temp_str = 'hello,i'm Hongten,welcome to my space!'
42     temp_list = str_to_list(temp_str)
43     cnt = counter(cnt, temp_list)
44     print(cnt)
45 
46 def test_file():
47     '''
48     读取一个文件，把文件中的内容转化为字符串
49     统计该字符串中每个字符串出现的次数
50     '''
51     cnt = get_counter()
52     temp_path = 'c:\temp.txt'
53     temp_str = get_file_str(temp_path)
54     temp_list = str_to_list(temp_str)
55     cnt = counter(cnt, temp_list)
56     print(cnt)
57     
58 def main():
59     test_str()
60     print('#' * 50)
61     test_file()
62 
63 if __name__ == '__main__':
64     main()