old_contents: """
  Django Storage interface, using the file system backend.
  """
  from django.core.files.storage import FileSystemStorage
  from django.core.urlresolvers import reverse_lazy
  from django.utils.deconstruct import deconstructible
  from django.utils.encoding import force_text
  
  from private_storage import appconfig
  
  
  @deconstructible
  class PrivateFileSystemStorage(FileSystemStorage):
      """
      Interface to the Django storage system,
      storing the files in a private folder.
      """
      def __init__(self, location=None, base_url=None, **kwargs):
          if location is None:
              location = appconfig.PRIVATE_STORAGE_ROOT
  
          super(PrivateFileSystemStorage, self).__init__(
              location=location,
              base_url=base_url,
              **kwargs
          )
          if base_url is None:
              # When base_url is not given, it's autodetected.
              # However, as the super method checks for base_url.endswith('/'),
              # the attribute is overwritten here to avoid breaking lazy evaluation.
              self.base_url = reverse_lazy('serve_private_file', kwargs={'path': ''})
  
      def url(self, name):
          # Make sure reverse_lazy() is evaluated, as Python 3 won't do this here.
          self.base_url = force_text(self.base_url)
          return super(PrivateFileSystemStorage, self).url(name)
  
new_contents: """
  Django Storage interface, using the file system backend.
  """
  from django.core.files.storage import FileSystemStorage
  from django.utils.deconstruct import deconstructible
  from django.utils.encoding import force_text
  
  try:
      from django.urls import reverse_lazy  # Added in Django 1.10
  except ImportError:
      from django.core.urlresolvers import reverse_lazy
  
  from private_storage import appconfig
  
  
  @deconstructible
  class PrivateFileSystemStorage(FileSystemStorage):
      """
      Interface to the Django storage system,
      storing the files in a private folder.
      """
      def __init__(self, location=None, base_url=None, **kwargs):
          if location is None:
              location = appconfig.PRIVATE_STORAGE_ROOT
  
          super(PrivateFileSystemStorage, self).__init__(
              location=location,
              base_url=base_url,
              **kwargs
          )
          if base_url is None:
              # When base_url is not given, it's autodetected.
              # However, as the super method checks for base_url.endswith('/'),
              # the attribute is overwritten here to avoid breaking lazy evaluation.
              self.base_url = reverse_lazy('serve_private_file', kwargs={'path': ''})
  
      def url(self, name):
          # Make sure reverse_lazy() is evaluated, as Python 3 won't do this here.
          self.base_url = force_text(self.base_url)
          return super(PrivateFileSystemStorage, self).url(name)
  
subject: Support reverse() import change