def METHOD_NAME(s):
    if len(s) < len(self.idxs):
        i = self.idxs[len(s)]
        addr = self.txdata['address']
        addr = addr[:i] + '<u><b>' + addr[i:i+1] + '</u></b>' + addr[i+1:]
        self.addrtext.setHtml(str(addr))
    else:
        self.addrtext.setHtml(_("Press Enter"))