code: def CEscape(text, as_utf8):
      # type: (...) -> str
      """Escape a bytes string for use in an text protocol buffer.
  
      Args:
        text: A byte string to be escaped.
        as_utf8: Specifies if result may contain non-ASCII characters.
            In Python 3 this allows unescaped non-ASCII Unicode characters.
            In Python 2 the return value will be valid UTF-8 rather than only ASCII.
      Returns:
        Escaped string (str).
      """
      # Python's text.encode() 'string_escape' or 'unicode_escape' codecs do not
      # satisfy our needs; they encodes unprintable characters using two-digit hex
      # escapes whereas our C++ unescaping function allows hex escapes to be any
      # length.  So, "\0011".encode('string_escape') ends up being "\\x011", which
      # will be decoded in C++ as a single-character string with char code 0x11.
      if six.PY3:
          text_is_unicode = isinstance(text, str)
          if as_utf8 and text_is_unicode:
              # We're already unicode, no processing beyond control char escapes.
              return text.translate(_cescape_chr_to_symbol_map)
          ord_ = (
              ord if text_is_unicode else lambda x: x
          )  # bytes iterate as ints.
      else:
          ord_ = ord  # PY2
      if as_utf8:
          return "".join(_cescape_unicode_to_str[ord_(c)] for c in text)
      return "".join(_cescape_byte_to_str[ord_(c)] for c in text)
  
label_desc: Use image node_id 1 for calling a global function with example usage: CEscape(text, as_utf8) and returns: str, str, text