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')
