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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 get_columns(self, index, columns=None, as_dict=False):
 """ For a single index and list of column names return a DataFrame of the values in that index as either a dict or a DataFrame :param index: single index value :param columns: list of column names :param as_dict: if True then return the result as a dictionary :return: DataFrame or dictionary """

        i = sorted_index(self._index, index) if self._sort else self._index.index(index)
        return self.get_location(i, columns, as_dict)