docs: def file_to_base64(path_or_obj, max_mb=None):
      """converts contents of a file to base64 encoding
  
      :param str_or_object path_or_obj: fool pathname string for a file or a file like object that supports read
      :param int max_mb: maximum number in MegaBytes to accept
      :param float lon2: longitude of second place (decimal degrees)
  
      :raises ErrorFileTooBig: if file contents > max_mb (see :class:`ErrorFileTooBig`)
      :raises IOError: if file path can't be found (Also possible other exceptions depending on file_object)
      """
      if not hasattr(path_or_obj, 'read'):
          rt = read_file(path_or_obj)
      else:
          rt = path_or_obj.read()
      if max_mb:
          len_mb = len(rt) / (10024.0 * 1000)
          if len_mb > max_mb:
              raise ErrorFileTooBig("File is too big ({.2f} MBytes)" (len_mb))
      return b64encode(rt)