使用 scrapy 选择单选按钮

Question

我将如何使用 scrapy 选择单选按钮？

我正在尝试选择以下内容

formdata={'rd1':'E'} does not work

<input type="radio" name="rd1" value="E" checked="checked" />Employee
<input type="radio" name="rd2" value="o" />Other

Answer 1

您可以使用 lxml.cssselector 来选择单选按钮。

>>> import lxml.html
>>> from lxml.cssselect import CSSSelector
>>> str = """
... '<input type="radio" name="rd1" value="E" checked="checked" />Employee
... <input type="radio" name="rd2" value="o" />Other'
... """
>>> input_sel = CSSSelector('input[name="rd1"]')
>>> lx = lxml.html.fromstring(str)
>>> input_sel(lx)
[<InputElement b7e7665c name='rd1' type='radio'>]

Answer 2

我刚刚遇到了类似的问题（当然这就是我来这里的原因）。芝加哥市的这个精彩网站（https://webapps1.chicago.gov/buildingrecords/home) 要求您的机器人通过单选按钮和单击按钮来“同意”他们的“免责声明”（这确实非常有趣！）。我在 scrapy.FormRequest.from_response 的帮助下解决了这个问题：

def agreement_failed(response):
    # check the result of your first post here
    return  # something if it's a failure or nothing if it's not


class InspectionsListSpider(scrapy.Spider):
    name = 'inspections_list'
    start_urls = ['https://webapps1.chicago.gov/buildingrecords/home']

    def parse(self, response):
        return scrapy.FormRequest.from_response(
            response,
            formid='agreement',
            formdata = {"agreement": "Y",
                        "submit": "submit"},
            callback = self.after_agreement
            )

    def after_agreement(self, response):
        if agreement_failed(response):
            self.logger.error("agreement failed!")
            return
        else:
            ... # whatever you are going to do after

与页面代码一起，它非常不言自明。您可能还需要此处描述的表单的其他参数：https://docs.scrapy.org/en/latest/topics/request-response.html?highlight=FormRequest()#scrapy.http.FormRequest.from_response

PS下一页的谜语也可以用同样的方式解决。 :)