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from django import template
from django.utils.html import format_html
from django.contrib.admin.templatetags.admin_static import static
register = template.Library()
@register.filter
def boolean_icon(value):
icon_url = static('admin/img/icon-%s.gif' %
{True: 'yes', False: 'no', None: 'unknown'}[value])
alt_text = {True: 'yes', False: 'no', None: 'pending' }[value]
return format_html('<img src="{0}" alt="{1}" />', icon_url, alt_text)
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