读取.csv数据/写入另外一个.csv (Python)

def test(src, dst, index):
    with open(dst, 'wb') as df:
        with open(src, 'rb') as csvfile:

            # 使用reader函数，接收一个可迭代的对象
            reader = csv.reader(csvfile)

            # 列表解析
            rows = [row for row in reader]

            # 根据索引提取其中某一列
            column = [row[index]for row in reader]

            # 初始化一个二维矩阵
            b = numpy.array(rows)     # (125973, 41)

            # 将list中的字符转为数字
            column_f = map(float, column)

            # 给每个列表中的每个元素进行归一化
            # for i in column_f:
            #     newValue = (i - min(column_f)) / (max(column_f) - min(column_f))
            #     print(newValue)

            writer = csv.writer(df)
            # 执行写操作
            writer.writerows(column)
            # 关闭文件
            df.close()


if __name__ == "__main__":
      test('ss.csv', 'test.csv', 0)