2021年10月18日14:15:22 星期一
python 文件操作函数 readlines 和 tell 例子

示例代码 test.py

import sys

if __name__ == '__main__':
    fn = str(sys.argv[1])
    with open(fn, 'r+') as f:
        print "file name: ", f.name
        print("current postion is "+str(f.tell()))
        line_count = len(f.readlines())
        print("line_count is "+str(line_count))
        print("current postion is "+str(f.tell()))

data.txt

cat data.txt 
1 a
2 b
3 c
4 d
5 e
6 f

验证

$ python test.py data.txt 
file name:  data.txt
current postion is 0
line_count is 6
current postion is 23