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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 _drop_index_command(self, command, type, index):
 """ Create a new drop index command on the blueprint. :param command: The command :type command: str :param type: The index type :type type: str :param index: The index name :type index: str :rtype: Fluent """

        columns = []

        if isinstance(index, list):
            columns = index

            index = self._create_index_name(type, columns)

        return self._index_command(command, columns, index)