request在该范围内不是变量。你必须首先从上下文中获取它。传递takes_context给装饰器并添加context到tag参数。
像这样：
@register.inclusion_tag('new/userinfo.html', takes_context=True)
def address(context):
request = context['request']
address = request.session['address']
return {'address':address}
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