Djangomarkdown无法代码高亮

import markdown



from django import template

from django.template.defaultfilters import stringfilter

from django.utils.encoding import force_text

from django.utils.safestring import mark_safe



register = template.Library()





@register.filter(is_safe=True)  

@stringfilter  

def custom_markdown(value):

    return mark_safe(markdown.markdown(value,

        extensiOns=['markdown.extensions.fenced_code', 'markdown.extensions.codehilite'], safe_mode=True, enable_attributes=False))

{% load custom_markdown %}

{{ post.content|custom_markdown }}