python脚本获取文件的创建于修改日期并计算时间差

由于在计算一个算法的运行时间的时候，需要将文件的创建日期与修改日期读取到，然后计算两者之差，在网上搜索了相关的程序之后，自己又修改了一下，把代码贴在这里，供以后查阅使用，也希望可以帮到其他人。

 # -*- coding: utf-8 -*-
 """
 Created on Mon Dec 12 14:59:46 2016
 
 @author: shenruixue
 
 to calculate size after filter in conv and pool
 """
 import os.path, time
 import exceptions
 class TypeError (Exception):
   pass
 if __name__ == '__main__':
  file_srx = open("train_1920_1080.set")#其中包含所有待计算的文件名
  line = file_srx.readline()
  diff_time_all = 0
  while line:
   f = line[:-1]    # 除去末尾的换行符
   print (f)
   print ('***********************************************************')
   mtime = time.ctime(os.path.getmtime(f))
   ctime = time.ctime(os.path.getctime(f))
   mtime_s = (os.path.getmtime(f))
   ctime_s = (os.path.getctime(f))
   print "Last modified : %s, last created time: %s" % (mtime, ctime)
   diff_time = (int(mtime_s) - int(ctime_s))
   diff_time_all = diff_time_all + diff_time
   print "diff time is ", diff_time
   line = file_srx.readline()
  print "diff_time_all is ", diff_time_all
  file_object = open('train_1920_1080.txt', 'w')
  file_object.write(str(diff_time_all))
  file_object.close( )