我的应用程序的一部分有问题。一切正常，但当我点击一个名为“koszyk”的链接时，我得到：
TypeError at /sklep/koszyk/
'str' object is not callable
Request Method: GET
Request URL: http://localhost:8000/sklep/koszyk/
Exception Type: TypeError
Exception Value: 'str' object is not callable
Exception Location: /usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py in get_response, line 99
Python Executable: /usr/bin/python
Python Version: 2.7.6
Python Path: ['/home/mdawidowski/szkola/django/sklepik', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PILcompat', '/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/python2.7/dist-packages/ubuntu-sso-client']
Server time: Pi, 5 Czerw 2015 18:49:26 +0200
我已经尝试了一切，但找不到任何东西......我只知道问题出在模型“koszyk”上，因为其他一切都运行良好。我希望你能帮助我。
我的文件：Views.py
# coding: utf-8
from django.http import HttpResponseRedirect
from django.core.urlresolvers import reverse
from django.views.generic.simple import direct_to_template
from django.core.mail import send_mail …