python - 如何将两个用户定义的参数传递给 scrapy 蜘蛛

Question

正在关注 How to pass a user defined argument in scrapy spider ，我写了下面这个简单的蜘蛛:

import scrapy

class Funda1Spider(scrapy.Spider):
    name = "funda1"
    allowed_domains = ["funda.nl"]

    def __init__(self, place='amsterdam'):
        self.start_urls = ["http://www.funda.nl/koop/%s/" % place]

    def parse(self, response):
        filename = response.url.split("/")[-2] + '.html'
        with open(filename, 'wb') as f:
            f.write(response.body)

这似乎可行；例如，如果我使用

从命令行运行它

scrapy crawl funda1 -a place=rotterdam

它生成一个 rotterdam.html 看起来类似于 http://www.funda.nl/koop/rotterdam/ .接下来我想扩展它以便可以指定一个子页面，例如 http://www.funda.nl/koop/rotterdam/p2/ .我尝试了以下方法:

import scrapy

class Funda1Spider(scrapy.Spider):
    name = "funda1"
    allowed_domains = ["funda.nl"]

    def __init__(self, place='amsterdam', page=''):
        self.start_urls = ["http://www.funda.nl/koop/%s/p%s/" % (place, page)]

    def parse(self, response):
        filename = response.url.split("/")[-2] + '.html'
        with open(filename, 'wb') as f:
            f.write(response.body)

但是，如果我尝试用

运行它

scrapy crawl funda1 -a place=rotterdam page=2

我收到以下错误:

crawl: error: running 'scrapy crawl' with more than one spider is no longer supported

我不太理解这个错误消息，因为我不是要抓取两个蜘蛛，而只是想传递两个关键字参数来修改 start_urls。我怎样才能做到这一点？

Answer 1

当提供多个参数时，您需要为每个 参数加上前缀-a。

您的案例的正确行是:

scrapy crawl funda1 -a place=rotterdam -a page=2