seek引发的python文件读写的问题及解决

install_times:1|install_times:2018-09-03 15:58:46
install_times:2|install_times:2018-09-03 15:58:50
install_times:3|install_times:2018-09-03 15:58:54

import time
import os
file_list = []
tags = False
with open("install_hadoop.txt", "r", encoding="utf-8") as f:
  flag = bool(f.readline())
  # obj = True
  # f.seek(0)
  if flag:
    tags = True
    for obj in f:
      tmp_list = obj.split("|")
      file_list.append(tmp_list)
    last_times = int(file_list[-1][0].split(":")[1]) + 1
    last_time = time.strftime("%Y-%m-%d %H:%M:%S")
  else:
    last_times = 1
    last_time = time.strftime("%Y-%m-%d %H:%M:%S")

with open("install_hadoop.txt", "r", encoding="utf-8") as f:
  flag = bool(f.readline())
  # obj = True
  <strong> f.seek(0)</strong>
  if flag:
    tags = True
    for obj in f:
      tmp_list = obj.split("|")
      file_list.append(tmp_list)
    last_times = int(file_list[-1][0].split(":")[1]) + 1
    last_time = time.strftime("%Y-%m-%d %H:%M:%S")
  else:
    last_times = 1
    last_time = time.strftime("%Y-%m-%d %H:%M:%S")

with open("install_hadoop.txt", "r", encoding="utf-8") as f:<br>  flag = bool(f.readline())<br>  # obj = True<br>  f.seek(0)<br>  <strong>print(os.path.getsize("install_hadoop.txt"))</strong><br>  if flag:<br>    tags = True<br>    for obj in f:<br>      tmp_list = obj.split("|")<br>      file_list.append(tmp_list)<br>    last_times = int(file_list[-1][0].split(":")[1]) + 1<br>    last_time = time.strftime("%Y-%m-%d %H:%M:%S")<br>  else:<br>    last_times = 1<br>    last_time = time.strftime("%Y-%m-%d %H:%M:%S")