Customizing the error list format Django

error_list_msg.py

# In form.py
from django.forms.util import ErrorList
from django.utils.safestring import mark_safe

class ErrorListMsg(ErrorList):
    def __unicode__(self):
        return self.as_msg()
    
    def as_msg(self):
        if not self: return u''
        return mark_safe(u'\n'.join([u'<span class="red">%s</span>' % e for e in self]))

#In view.py
file_form = form_class(request.POST,request.FILES,error_class=ErrorListMsg)