django模板语言循环字典，及forloop

views:

from django.shortcuts import render,redirect
from django.shortcuts import HttpResponse
# Create your views here.
from django.views import View
class Home(View):
    def dispatch(self, request, *args, **kwargs):
        print('before')
        result = super(Home,self).dispatch(request,*args,**kwargs)
        print('after')
        return result
    def get(self,request):
        print('in get')
        return render(request,'home.html')
    def post(self,request):
        print('in post')
        return render(request,'home.html')

user_dict = {
    'k1':{'name':'hrg','email':'hrg@163.com','pwd':'123'},
    'k2':{'name':'eric','email':'hrg@163.com','pwd':'111'},
    'k3':{'name':'hhh','email':'hrg@163.com','pwd':'222'},
    'k4':{'name':'kkk','email':'hrg@163.com','pwd':'123'},
}

def detail(request,uid,nid):
    v = "nid:"+nid+"uid:"+uid
    return render(request,'detail.html',{'user_dict':user_dict,})

templates:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <ul>
        {% for k in user_dict.keys %}
            <li>{{ k }}</li>
        {% endfor %}
    </ul>
    <ul>
        {% for v in user_dict.values %}
            <li>{{ v }}</li>
        {% endfor %}
    </ul>
    <ul>
        {% for k,v in user_dict.items %}
            <li>{{ k }}:{{ v }}</li>
        {% endfor %}
    </ul>
</body>
</html>

　　在每一个for循环中，都有一forloop属性。

　　　　forloop.counter 当前循环的计数器顺排，用处大了，可以给循环打上序号

　　　　forloop.counter0 当前循环的计数器顺排，从0开始

　　　　forloop.revcounter forloop.revcounter0 跟上面一样是倒排

　　　　forloop.first forloop.last 是否是第一次循环或最后一次循环

{% for i in v1 %}
    <tr><td>{{ forloop.counter }}</td></td></tr>
{% endfor %}

　　如果还有嵌套for，子for内还有 forloop.parentloop属性是一个包含上面6个属性的字典，其值如：

　　　　{'parentloop': {}, 'counter0': 0, 'counter': 1, 'revcounter': 3, 'revcounter0': 2, 'first': True, 'last': False}