code: def pickle_f2m(pth, rt=None):
      
      r = rt
      try:
          with open(pth, 'rb') as f:
              r = pickle.load(f)
      except Exception as err:
          sys.stderr.write('pickle_f2m(pth={}) with error: {}\n'.format(pth, err))
      return r
docs: 获取文件内容并返回, 如果文件不存在, 则返回 rt
  
      :param pth:
      :type pth:
      :param rt: ``如果需要指定返回值, 请设置该值``
      :type rt:
      :return:
      :rtype: