详解python脚本自动生成需要文件实例代码

def produceBnf(infilename,outfilename):
  List=[]
  with open(infilename,'r') as inf:
    for line in inf.readlines():
      List.append(re.match("正则表达式").group("文件头");
    for command in List:
        outf.write(“写入刚刚读取的内容（也可能是某种对应关系）”)
        outf.write("写入其他内容")
    outf.write("写入文件尾")

infile=sys.argv[1]
produceBnf(infile,os.path.join(os.path.dirname(infile),"输出文件的名字"));