上下文处理器,通过不存在的会话

您可以获得如下默认值 None 这种方式: request.session.get('user', None) . 就像普通的Python指令一样。

user = request.session.get('user', None)

或者,

user = None
if 'user' in request.session:
    user = request.session['user']

def get_user_details(request):
    try:
        user = request.session['user']
    except KeyError:
        return
    data = {
        'user':user
    }
    return data

def render_home(request):
    try:
        return render_to_response("home", context_instance=RequestContext(request))
    except KeyError:
        return