Django 1.11 LTS 主な変更点まとめ ref: http://qiita.com/ryu22e/items/f97e56ece566d06bb699

models.py

from django.db import models


class Book(models.Model):
    title = models.CharField(max_length=100)
    author = models.CharField(max_length=100)
    price = models.IntegerField()

    class Meta:
        indexes = [
            models.Index(fields=['title', 'author']),
            models.Index(fields=['price'], name='price_idx'),  # インデックスに名前を付けられる
        ]

range.html

<input type="range" name="{{ widget.name }}"{% include "django/forms/widgets/attrs.html" %}{% if widget.value %} value="{{ widget.value }}"{% endif %}>

widgets.py

from django import forms


class RangeWidget(forms.Widget):
    template_name = 'forms/widgets/range.html'

widgets_1_8.py

from django import forms
from django.forms.utils import flatatt
from django.utils.encoding import force_text
from django.utils.html import format_html


class RangeWidget(forms.Widget):
    def render(self, name, value, attrs=None):
        final_attrs = self.build_attrs(attrs, name=name)
        if value is None:
            value = ''
        if value != '':
            final_attrs['value'] = force_text(value)
        return format_html('<input type="range"{}>',
                           flatatt(final_attrs))