启用session

在视图中使用session

# 创建或修改 session：

request.session[key] = value

# 获取 session：

request.session.get(key,default**=**None)

# 删除 session

del request.session[key] # 不存在时报错

例子：让用户不能评论两次的应用（原来要用session实现不重复点赞）

from django.http import HttpResponse

def post_comment(request, new_comment):

if request.session.get(‘has_commented’, False):

return HttpResponse(“You’ve already commented.”)

c = comments.Comment(comment**=**new_comment)

c.save()

request.session[‘has_commented’] = True

return HttpResponse(‘Thanks for your comment!’)

一个简化的登陆认证：

def login(request):

m = Member.objects.get(username**=**request.POST[‘username’])

if m.password == request.POST[‘password’]:

request.session[‘member_id’] = m.id

return HttpResponse(“You’re logged in.”)

else:

return HttpResponse(“Your username and password didn’t match.”)

def logout(request):

try:

del request.session[‘member_id’]

except KeyError:

pass

return HttpResponse(“You’re logged out.”)