django自定义过滤器实例

需求：通过以键方式从字典中取值，如 test[key]=value

views.py

from django.template import RequestContextfrom django.shortcuts import render_to_responsedef view(request)    dicts = {"key1": 1, "key2": 2, "key3": 3, }     return render_to_response("index.html",  {"dicts":dicts,},context_instance = RequestContext(request))

1.在app目录下建立templatetags/在此目录下建立空文件__init__.py和myfilter.py

2.在myfilter.py编辑

from django import templateregister = template.Library()def key(d,key_name):        value = 0        try:                value = d[key_name]        except KeyError:                value = 0        return valueregister.filter('key',key)

3.在模板中使用

{% load myfilter %} #加载自定认标签{{dicts|key:"key1"}}