old_contents: from django.forms import widgets
  from django.template.loader import render_to_string
  
  from .app_settings import (
      WIDGET_MEDIA_JS, WIDGET_MEDIA_CSS,
      READONLY_WIDGET_MEDIA_JS, READONLY_WIDGET_MEDIA_CSS
  )
  
  
  class JSONSuit(widgets.Textarea):
      def render(self, name, value, attrs={}, renderer=None):
          attrs.update({'class': 'hidden'})
          textarea = super(JSONSuit, self).render(name, value, attrs)
          return render_to_string('jsonsuit/widget.html', {
              'name': name, 'value': value, 'textarea': textarea})
  
      class Media:
          js = WIDGET_MEDIA_JS
          # https://docs.djangoproject.com/en/1.9/topics/forms/media/#css
          css = WIDGET_MEDIA_CSS
  
  
  class ReadonlyJSONSuit(widgets.Widget):
      def render(self, name, value, attrs=None, renderer=None):
          return render_to_string('jsonsuit/readonly_widget.html', {
              'name': name, 'value': value, 'attrs': attrs})
  
      class Media:
          js = READONLY_WIDGET_MEDIA_JS
          # https://docs.djangoproject.com/en/1.9/topics/forms/media/#css
          css = READONLY_WIDGET_MEDIA_CSS
  
new_contents: from django.forms import widgets
  from django.template.loader import render_to_string
  
  from .app_settings import (
      WIDGET_MEDIA_JS, WIDGET_MEDIA_CSS,
      READONLY_WIDGET_MEDIA_JS, READONLY_WIDGET_MEDIA_CSS
  )
  
  
  class JSONSuit(widgets.Textarea):
      def render(self, name, value, attrs={}, renderer=None):
          attrs.update({'class': 'hidden'})
          textarea = super(JSONSuit, self).render(name, value, attrs)
          return render_to_string('jsonsuit/widget.html', {
              'name': name, 'value': value, 'textarea': textarea})
  
      class Media:
          # https://docs.djangoproject.com/en/dev/topics/forms/media/#js
          js = WIDGET_MEDIA_JS
          # https://docs.djangoproject.com/en/dev/topics/forms/media/#css
          css = WIDGET_MEDIA_CSS
  
  
  class ReadonlyJSONSuit(widgets.Widget):
      def render(self, name, value, attrs=None, renderer=None):
          return render_to_string('jsonsuit/readonly_widget.html', {
              'name': name, 'value': value, 'attrs': attrs})
  
      class Media:
          # https://docs.djangoproject.com/en/dev/topics/forms/media/#js
          js = READONLY_WIDGET_MEDIA_JS
          # https://docs.djangoproject.com/en/dev/topics/forms/media/#css
          css = READONLY_WIDGET_MEDIA_CSS
  
subject: Update django doc links