Python合并指定文件夹内所有TXT文件的方法

# -*- coding:utf-8*-
import sys
reload(sys)
sys.setdefaultencoding('utf-8')
import os
import os.path
import time
time1=time.time()
##########################合并同一个文件夹下多个txt################
def MergeTxt(filepath,outfile):
  k = open(filepath+outfile, 'a+')
  for parent, dirnames, filenames in os.walk(filepath):
    for filepath in filenames:
      txtPath = os.path.join(parent, filepath) # txtpath就是所有文件夹的路径
      f = open(txtPath)
      ##########换行写入##################
      k.write(f.read()+"\n")
  k.close()
  print "finished"
if __name__ == '__main__':
  filepath="D:/course/"
  outfile="result.txt"
  MergeTxt(filepath,outfile)
  time2 = time.time()
  print u'总共耗时：' + str(time2 - time1) + 's'