old_contents: """
  A storage implementation that overwrites exiting files in the storage
  
  See "Writing a custom storage system"
  (https://docs.djangoproject.com/en/1.3/howto/custom-file-storage/) and
  the discussion on stackoverflow on "ImageField overwrite image file"
  (http://stackoverflow.com/questions/9522759/imagefield-overwrite-image-file)
  """
  
  import os.path
  from django.core.files.storage import FileSystemStorage
  
  class OverwriteStorage(FileSystemStorage):
  
      def get_available_name(self, name):
          return name
  
      def _save(self, name, content):
          full_path = self.path(name)
          # make sure an existing file is replaced by removing the
          # original file first
          if os.path.exists(full_path):
              os.remove(full_path)
          return super(OverwriteStorage, self)._save(name, content)
  
  
new_contents: """
  A storage implementation that overwrites exiting files in the storage
  
  See "Writing a custom storage system"
  (https://docs.djangoproject.com/en/1.3/howto/custom-file-storage/) and
  the discussion on stackoverflow on "ImageField overwrite image file"
  (http://stackoverflow.com/questions/9522759/imagefield-overwrite-image-file)
  """
  
  import os.path
  from django.core.files.storage import FileSystemStorage
  
  class OverwriteStorage(FileSystemStorage):
  
      def get_available_name(self, name, max_length=None):
          return name
  
      def _save(self, name, content):
          full_path = self.path(name)
          # make sure an existing file is replaced by removing the
          # original file first
          if os.path.exists(full_path):
              os.remove(full_path)
          return super(OverwriteStorage, self)._save(name, content)
  
  
subject: Migrate to new Storage API