code: def write_file_prefix(f: IO[Any], interpreter: str) -> None:
      
      # if the provided path is too long for a shebang we should error out
      if len(interpreter) > BINPRM_BUF_SIZE:
          sys.exit(BINPRM_ERROR)
  
      f.write(b"#!" + interpreter.encode(sys.getfilesystemencoding()) + b"\n")
docs: Write a shebang line.
  
      :param f: An open file handle.
      :param interpreter: A path to a python interpreter.