human
I wrote the below code

    def repl(m):
        return ''.join((('$%02x' % utils.asbyteint(ch)) for ch in m.group(0).encode('utf8')))
    ret = re.sub(_re_invalid_char, repl, text)
    if (not isinstance(ret, str)):
        return ret.encode('ascii')
    return ret

What's a good function header?
 Here's a good function header?
assistant
#Here's a good function header.

def _escape_string(text):