Django widget for bootstrap-datetimepicker

bs_datetime.py

from django import forms
from django.utils.safestring import mark_safe

class DateTimeWidget(forms.DateTimeInput):
    class Media:
        css = {
           "all": ("bootstrap-datetimepicker/css/bootstrap-datetimepicker.min.css",)
        }
        js = ("bootstrap-datetimepicker/js/bootstrap-datetimepicker.min.js")

    def __init__(self, attrs=None, format=None):
        format = "%Y-%m-%d %H:%M:%S" #this is fixed for now
        if attrs is None:
            attrs = {}
        attrs.update({"data-format": "yyyy-MM-dd hh:mm:ss"})
        super(DateTimeWidget, self).__init__(attrs, format=format)

    def render(self, name, value, attrs=None):
        return mark_safe(
            u'<div class="input-append">' + \
            super(DateTimeWidget, self).render(name, value, attrs) + \
            u'<span class="add-on"><i class="icon-calendar"  ' + \
            u'data-time-icon="icon-time" data-date-icon="icon-calendar">' + \
            u'</i></span></div>')