大牛们帮我看看问题 出在哪里？

AttributeError at /login
'WSGIRequest' object has no attribute 'session'
Request Method: GET
Request URL: http://127.0.0.1:8000/login
Django Version: 1.8.2
Exception Type: AttributeError
Exception Value:
'WSGIRequest' object has no attribute 'session'
Exception Location: /home/itcast/pycharm_mapping/test4/booktest/views.py in login, line 74
Python Executable: /home/itcast/.virtualenvs/bj11_py3/bin/python
Python Version: 3.5.2
Python Path:
['/home/itcast/pycharm_mapping/test4',
'/home/itcast/.virtualenvs/bj11_py3/lib/python35.zip',
'/home/itcast/.virtualenvs/bj11_py3/lib/python3.5',
'/home/itcast/.virtualenvs/bj11_py3/lib/python3.5/plat-x86_64-linux-gnu',
'/home/itcast/.virtualenvs/bj11_py3/lib/python3.5/lib-dynload',
'/usr/lib/python3.5',
'/usr/lib/python3.5/plat-x86_64-linux-gnu',
'/home/itcast/.virtualenvs/bj11_py3/lib/python3.5/site-packages']
Server time: Fri, 13 Jul 2018 16:10:50 +0000