python开发_count()

python中的count()函数，从字面上可以知道，他具有统计功能

下面来看看具体的demo：

功能：读取一个文件\'c:\\test.txt\'，统计出该文件中出现字符\'a\'的次数

 1 #python open
 2 import os
 3 
 4 number = 0
 5 
 6 def get_number_of_char(filePath, c):
 7     \'\'\'
 8     from path, the system will get the file
 9     finally return the number char: c
10     \'\'\'
11     if os.path.exists(filePath):
12         global number
13         with open(filePath, \'r\') as fp:
14             for line in fp:
15                 a = line.count(c)
16                 number = number + a
17     else:
18         print(\'the path:[{}] is not exist!\'.format(filePath))
19 
20 def main():
21     file_path = \'c:\\test.txt\'
22     get_number_of_char(file_path, \'a\')
23     print(number)
24     
25 if __name__ == \'__main__\':
26     main()

运行效果：