[PYTHON] How to insert a specific process at the start and end of spider with scrapy

It is a method to write a function that hooks at the start and end of spider.

Place the following content directly under the project.

import scrapy

class SpiderHook(object):

    def from_crawler(cls, crawler):
        ext = cls

        crawler.signals.connect(ext.spider_opened, signal=scrapy.signals.spider_opened)
        crawler.signals.connect(ext.spider_closed, signal=scrapy.signals.spider_closed)

        return ext

    def spider_opened(self, spider):
        #Processing at the start of spider

    def spider_closed(self, spider):
        #Processing at the end of spider

Then write the settings to load this class in settings.py.

    '<project name>.<file name>. SpiderHook': 100,

reference: https://doc.scrapy.org/en/latest/topics/extensions.html

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