# ecoding=utf-8
ifn = r"train.txt"
ofn = r"train_output.txt"

infile = open(ifn,'rb')
outfile = open(ofn,'wb')

for eachline in infile.readlines():
  #去掉文本行里面的空格、\t、数字（其他有要去除的也可以放到' \t1234567890'里面）
  lines = filter(lambda ch: ch not in ' \t1234567890', eachline) 

  outfile.write(lines) # 写入train_output.txt(此处是一股脑的全写进去，并没有做任何的分行处理)

infile.close
outfile.close