@property
    def signature_backend(self):
        """Signature backend instance.

        This is a shortcut property using a cache.
        If you want to adapt the implementation, consider overriding
        :meth:`get_signature_backend`.

        """
        try:
            return self._signature_backend
        except __HOLE__:
            self._signature_backend = self.get_signature_backend()
            return self._signature_backend
dataset/ETHPy150Open novafloss/django-docusign/django_docusign/views.py/SignatureCallbackView.signature_backend