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

 #python open
 import os

 number = 0

 def get_number_of_char(filePath, c):
     '''
     from path, the system will get the file
     finally return the number char: c
     '''
     if os.path.exists(filePath):
         global number
         with open(filePath, 'r') as fp:
             for line in fp:
                 a = line.count(c)
                 number = number + a
     else:
         print('the path:[{}] is not exist!'.format(filePath))

 def main():
     file_path = 'c:\\test.txt'
     get_number_of_char(file_path, 'a')
     print(number)

 if __name__ == '__main__':
     main()

运行效果：