Python实现将目录中TXT合并成一个大TXT文件的方法

#coding=gbk
import os
import sys
import glob
def dirTxtToLargeTxt(dir,outputFileName):
  '''从dir目录下读入所有的TXT文件,将它们写到outputFileName里去'''
  #如果dir不是目录返回错误
  if not os.path.isdir(dir):
    print "传入的参数有错%s不是一个目录" %dir
    return False
  #list all txt files in dir
  outputFile = open(outputFileName,"a")
  for txtFile in glob.glob(os.path.join(dir,"*.txt")):
    print txtFile
    inputFile = open(txtFile,"rb")
    for line in inputFile:
      outputFile.write(line)
  return True
if __name__ =="__main__":
  if len(sys.argv) < 3:
    print "Usage:%s dir outputFileName" %sys.argv[0]
    sys.exit()
  dirTxtToLargeTxt(sys.argv[1],sys.argv[2])