Python For 循环迭代未按预期顺序

Question

请查看以下 csv 文件的前 2 行。第一行是字段名，第二行是实际数据的第一行。

我正在尝试遍历第一行，然后将值按原始顺序存储到数组中。

age workclass   fnlwgt  education   education-num   marital-status  occupation     relationship     race    sex   capital-gain  capital-loss    hours-per-week  native-country  label
59  Private    307423    9th              5        Never-married    Other-service    Not-in-family  Black   Male    0              0                   50          United-States    0



reader = csv.DictReader(csvfile)
    train_x = []
    train_y = []
    dic = {}

    for row in reader:

        row_x = []

        for title in row.keys():
            l = ['workclass','education','marital-status','occupation', 'relationship', 'race', 'sex', 'native-country']
            if title in l:
                value = get_dict[title][row[title]]
                row_x.append(value)
            elif title == 'label':
                train_y.append(float(row['label']))
            else:
                row_x.append(float(row[title]))


        train_x.append(row_x)

这是我在第一行得到的：

[3, 5, 59.0, 0.0, 0, 50.0, 4, 35, 5.0, 0.0, 8, 307423.0, 4, 3]

如您所见，字段的顺序是错误的。 （注意美国是 35，Private 是 3...）

为了方便，这里也复制了 csv 行：

age workclass   fnlwgt  education   education-num   marital-status  occupation     relationship     race    sex   capital-gain  capital-loss    hours-per-week  native-country  label
59  Private    307423    9th              5        Never-married    Other-service    Not-in-family  Black   Male    0              0                   50          United-States    0

Answer 1

您正在使用 DictReader 读取 csv，它会将 CSV 读入 .. 字典。 字典中的键没有固定的顺序。 看看基本的reader方法

https://docs.python.org/2/library/csv.html#csv.reader