old_contents: from oscar.core.loading import load_class
  
  from . import mixins
  
  
  ProductCategoryView = load_class('catalogue.views', 'ProductCategoryView')
  
  
  class FancyPageDetailView(mixins.OscarFancyPageMixin, ProductCategoryView):
      pass
  
new_contents: from oscar.core.loading import get_class
  
  from . import mixins
  
  
  ProductCategoryView = get_class('catalogue.views', 'ProductCategoryView')
  
  
  class FancyPageDetailView(mixins.OscarFancyPageMixin, ProductCategoryView):
      pass
  
subject: Fix class loader called in Oscar contrib package