plt.style.use('ggplot')g = sns.catplot(    x = 'YearBuilt',    y = 'SalePrice',    data = train,    kind='swarm',    hue='OverallQual',    palette = 'Set2', height=6, aspect=2)locs, labels = plt.xticks()  # use if needed, as explained below.for axes in g.axes.flat:    for ind, label in enumerate(axes.get_xticklabels()):        if ind % 8 == 0:  # every nth label is kept            label.set_visible(True)        else:            label.set_visible(False)plt.title('House Sale Prices (log scale) vs. Year Built and Overall Quality')plt.xlabel('Year Built')plt.yscale('log')plt.ylim([4e4, 6e5])plt.yticks([6e4, 1e5, 1.4e5, 1.8e5, 2.4e5, 3.2e5, 4e5, 6e5], ['60k', '100k', '140K', '180k', '240K', '320k', '600k'])plt.ylabel('Sale Price ($)')plt.show()我正在嘗試對csv文件進行相對簡單的解析，我不明白為什么csv模塊不起作用。這是我的代碼：import csvdef getFromCSV(fileName):    with open(fileName, 'r') as f:        reader = csv.reader(f)        data = list(reader)    return datadef append_row(fileName, my_list):    with open(fileName, 'a') as output:        writer = csv.writer(output)        writer.writerow(my_list)data = getFromCSV('dh_internal_all.csv')for row in data:    if '25252' not in row:        print(row)        append_row('parsed.csv',[row])這將返回：dh-dfbhv2l:Documents jwr38$ python3 remove_bad_data.py Traceback (most recent call last):  File "remove_bad_data.py", line 13, in <module>    data = getFromCSV('dh_internal_all.csv')  File "remove_bad_data.py", line 3, in getFromCSV    reader = csv.reader(f)NameError: name 'csv' is not defined提前感謝您的任何提示。編輯：當我在終端中運行時，然后，然后，它似乎識別它，它返回：python3import csvcsv<module 'csv' from '/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.7/lib/python3.7/csv.py'>