class PageMaker:
    @classmethod
    def make_welcome_page(cls, mailaddr, filename):
        try:
            maildict = Database.get_json('maildata')
            username = maildict[mailaddr]
            writer = HtmlWriter(open(filename, 'w'))
            writer.title('Welcom to {}s page!'.format(username))
            writer.paragraph(username + 'のページへようこそ。')
            writer.paragraph('メール待っています。')
            writer.mailto(mailaddr, username)
            writer.close()
            print('{} is created for {} ({})'.format(filename, mailaddr, username))
        except Exception as e:
            _, _, tb = sys.exc_info()
            traceback.print_tb(tb)