problem with simple templatetags usage in django

I try to use templatetags in django but I have trouble. I defined enumhelper.py in the templatetags package. Then I load it at the top of employer_list.html like

开发者_如何学JAVA{% extends "base.html" %}
{% load enumhelper %}
{% block title %}{% endblock %}

Content of enumhelper.py is really simple.

register = template.Library()

@register.tag()
def enum_worker_number_range():
    return "sdsdsd" 

Then I want to use enum_worker_number_range in the employer_list.html as

{% block enumhelper %}
    {{ enum_worker_number_range }}
{% endblock %}

I expect to write sdsdsd at the page but I couldn't see anything. I am sure that load opearition is sucessful beacuse when I change enumhelper name it gives error.

Although load operation is successful, why I can't see the return value of enum_worker_number_range ?

Thanks

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@register.simple_tag
def enum_worker_number_range():
    return "sdsdsd"