humanize_bytes as filter in template of django

template:
{% load humanize %}
...
{% if el.filesize %}
    <a href="/get_file/{{el.filename}}">скачать ({{el.filesize|humanize_bytes:0}})</a>
{% else %}
    (0 байт)
{% endif %}

templatetags/humanize.py:
from django import template

register = template.Library()

@register.filter(name='humanize_bytes')
def humanize_bytes(bytes, precision=1):
    abbrevs = (
        (1 << 40L, 'ТБ'),
        (1 << 30L, 'ГБ'),
        (1 << 20L, 'МБ'),
        (1 << 10L, 'КБ'),
        (1, 'Б')
    )
    if bytes == 0:
        return '0 Б'
    if bytes == 1:
        return '1 Б'
    for factor, suffix in abbrevs:
        if bytes >= factor:
            break
    if precision:
        return '%.*f %s' % (precision, bytes / factor, suffix)
    return '%d %s' % (int(bytes / factor), suffix)