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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def add_backup_operation(self, backup, mode=None):
 """Add a backup operation to the version. :param backup: To either add or skip the backup :type backup: Boolean :param mode: Name of the mode in which the operation is executed For now, backups are mode-independent :type mode: String """

        try:
            if self.options.backup:
                self.options.backup.ignore_if_operation().execute()
        except OperationError:
            self.backup = backup