old_contents: # encoding: utf-8
  from django.views.generic import ListView
  
  from .viewmixins import OrderByMixin, PaginateMixin, SearchFormMixin
  
  
  class BaseListView(PaginateMixin, OrderByMixin, SearchFormMixin, ListView):
      """
      Defines a base list view that supports, pagination, ordering and basic search.
      
      Supports a filter description that can be used in templates:
      
          class ActiveCustomerList(BaseListView):
              filter_description = u"Active"
              queryset = Artist.active.all()
      
      
          {% block content %}
            <h2>
              {% if filter_description %}
                {{ filter_description|title }} customers
              {% else %}
                Customers
              {% endif %}
            </h2>
            <! -- more template -->
          {% end block %}
      """
      def get_filter_description(self):
          if hasattr(self, 'filter_description'):
              return self.filter_description
      
      def get_context_data(self, **kwargs):
          data = super(BaseListView, self).get_context_data(**kwargs)
          filter_description = self.get_filter_description()
          if filter_description:
              data.update({'filter_description': filter_description})
          return data
  
new_contents: # encoding: utf-8
  from django.views.generic import ListView
  
  from .viewmixins import OrderByMixin, PaginateMixin, SearchFormMixin
  
  
  class BaseListView(PaginateMixin, OrderByMixin, SearchFormMixin, ListView):
      """
      Defines a base list view that supports pagination, ordering and basic search.
      
      Supports a filter description that can be used in templates:
      
          class ActiveCustomerList(BaseListView):
              filter_description = u"Active"
              queryset = Artist.active.all()
      
      
          {% block content %}
            <h2>
              {% if filter_description %}
                {{ filter_description|title }} customers
              {% else %}
                Customers
              {% endif %}
            </h2>
            <! -- more template -->
          {% end block %}
      """
      def get_filter_description(self):
          if hasattr(self, 'filter_description'):
              return self.filter_description
      
      def get_context_data(self, **kwargs):
          data = super(BaseListView, self).get_context_data(**kwargs)
          filter_description = self.get_filter_description()
          if filter_description:
              data.update({'filter_description': filter_description})
          return data
  
subject: Remove comma.