django: custom template tags

app\templatetags\filters.py

from django import template

register = template.Library()
@register.filter(name='lookup')
def lookup(dict, arg:str, default=""):
    """从字典，通过key取value"""
    if str(arg) in dict:
        return dict[str(arg)]
    else:
        return default

@register.filter(name='get_item')     #处理等价于lookup
def get_item(dictionary, key):
    return dictionary.get(key)

{% load filters %}         // load: Loads a custom template tag set.

<div class="has-text-right">{{ dict_tax_rate|lookup:"tax_code" }}</div>

{{ my_dict.key }}
{{ my_object.attribute }}
{{ my_list.0 }}