scrapy爬虫，按照教程，为什么没有生成对应的html文件？

Question

教程地址：https://www.runoob.com/w3cnote/scrapy-detail.html

# -*- coding: utf-8 -*-
import scrapy


class ItcastSpider(scrapy.Spider):
    name = 'itcast'
    allowed_domains = ['itcast.cn']
    start_urls = ['http://itcast.cn/']

    def parse(self, response):
        filename = "teacher.html"
        open(filename,"w").write(response.body)

scrapy crawl itcast 之后文件夹下什么都没有生成，也没有报错，
我用的python版本为3.7

Answer 1

别信什么要加UA的，进去就是坑了。问题就是open(filename,"w").write(response.body)这句，将w改成wb即可