def delete_patch(self, patch_name=None, remove=False, backup=False):
        """ Delete specified patch from the series
        If remove is True the patch file will also be removed. If remove and
        backup are True a copy of the deleted patch file will be made.
        """
        if patch_name:
            patch = Patch(patch_name)
        else:
            patch = self.db.top_patch()
            if not patch:
                raise NoAppliedPatch(self.db)

        self._delete_patch(patch, remove=remove, backup=backup)
Delete specified patch from the series
        If remove is True the patch file will also be removed. If remove and
        backup are True a copy of the deleted patch file will be made.