code: def decode(string):
      
      if not string:
          return bytes()
      elif isinstance(string, str):
          return a2b_base64(string.encode('raw-unicode-escape'))
      else:
          return a2b_base64(string)
docs: Decode a raw base64 string, returning a bytes object.
  
      This function does not parse a full MIME header value encoded with
      base64 (like =?iso-8895-1?b?bmloISBuaWgh?=) -- please use the high
      level email.header class for that functionality.