Study Notes (19): 21 days clearance Python (Video Lesson only) - file pointer and write files

Learning immediately: https://edu.csdn.net/course/play/24797/282199?utm_source=blogtoedu

import os

# #文件指针
# with open('test46.py','ab',True) as f:
#     print(f.tell())
#     '''
#     seek(self,offset,whence)
#     offset:移动位数，整数是往后移，复数 往前移
#     whence:0，1，2 三个参数
#          0：从开头开始
#          1：从当前位置开始
#          2：从结尾开始
#     '''
#     f.seek(5)
#     print(f.tell())
#     #一个参数，从0开始移动N位
#     f.seek(10)
#     print(f.tell())
#     #两个参数，从当前位置移动N个位置
#     f.seek(-10,2)
#     print(f.tell())
#     f.seek(-5,1)
#     print(f.tell())
#
#     #获取文件的大小
#     print(os.path.getsize('test46.py'))


with open('test46.txt', 'ab', True) as f:
    f.write(('hello world' + os.linesep).encode('utf-8'))
    f.writelines((('hi you' + os.linesep).encode('utf-8'),
                  ('hi me ' + os.linesep).encode('utf-8')
                  ))