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：