code: def read_file(pth, use_str=False):
      
      cont = None
      try:
          with open(u'' + pth, 'rb') as fp:
              cont = fp.read()
  
          if use_str:
              cont = to_str(cont)
      except Exception as err:
          print(err)
      return cont
docs: 读取文件, 并返回内容,
          如果读取失败,返回None
  
      :param pth:
      :type pth:
      :return:
      :rtype: