python scrapy csv 设定表头顺序

网上搜出来的、通过创建类的办法调用settings属性并指定表头顺序的案例过时了。scrapy1.6之后已经没有scrapy.conf 和scrapy.scrapy.contrib。

以下是2021.10月更新的代码

#在spiders文件夹下创建py文件，代码如下：

from scrapy.utils.project import get_project_settings
from scrapy.exporters import CsvItemExporter

class MyProjectCsvItemExporter(CsvItemExporter):
    settings=get_project_settings()

    def __init__(self, *args, **kwargs):
        delimiter = settings['CSV_DELIMITER']
        kwargs['delimiter'] = delimiter

        fields_to_export = settings['FIELDS_TO_EXPORT']
        if fields_to_export :
            kwargs['fields_to_export'] = fields_to_export

        super(MyProjectCsvItemExporter, self).__init__(*args, **kwargs)

#在settings中增加变量FIELDS_TO_EXPORT，值为列表，列表里放入按需排序的item名字

FIELDS_TO_EXPORT = [
  &nb