Django 中的 request.session["name"] 会创建一个新列表吗？

Question

当我们写 request.session["tasks"] 并将其分配给 django 视图中的某些东西时，这意味着什么？就像下面的索引函数request.session["tasks"] = [ ] 中的脚本一样，这是否意味着已经为该特定会话创建了一个名为tasks 的空列表？如果是这样，所有这些会话详细信息都存储在 django 中的什么位置？还有add函数中的cleaned_data["task"]在这个脚本中到底做了什么？我尝试查看文档，但找不到任何令人满意的信息，所以如果这听起来有点愚蠢，我很抱歉，但我是 django 的新手，有时语法真的让我感到困惑，感谢任何帮助！

from django.shortcuts import render
from django import forms
from django.http import HttpResponseRedirect
from django.urls import reverse 
# Create your views here.

class NewTaskForm(forms.Form):
    task = forms.CharField(label = "New Task",min_length=8,max_length=16)
    priority = forms.IntegerField(label="Priority",min_value=1,max_value=5)



def index(request):
    if "tasks" not in request.session:
        request.session["tasks"] = []
    return render(request,"index.html",
    {
        "tasks":request.session["tasks"]
    })

def add(request):
    if request.method == "POST":
        vari = NewTaskForm(request.POST)
        if vari.is_valid():
            task = vari.cleaned_data["task"]
            request.session["tasks"] += [task]
            return HttpResponseRedirect(reverse("index"))
        else:
            return render(request,"other.html",
            {
                "form":vari
            })

    return render(request,"other.html",{
        "form" : NewTaskForm()
    }) 

Answer 1

Yes, It means an empty list named tasks has been created for that particular session. and django stores the session data in 'django_session' table. 


cleaned_data is used for validating the data.

# This line is used to pass the validated data from the form input.
task = vari.cleaned_data["task"]