Function usage

tools/python-3.11.9-amd64/Lib/smtpd.py:115–119

(code, msg='')

def usage(code, msg=''):
    print(__doc__ % globals(), file=sys.stderr)
    if msg:
        print(msg, file=sys.stderr)
    sys.exit(code)


class SMTPChannel(asynchat.async_chat):