def periodical(): username = request.cookies.get('username') if username in session['user']: per_db = ZwMySQL() pers = per_db.select_periodical() return render_template('periodical.html', pernum=len(pers), url='periodical', pers=pers, user='******', per_act='active') else: flash('you are not login') return render_template('login.html')