python - 无法在两个类之间建立桥梁

Question

我已经用 python 编写了一些代码，我的目的是将“web_parser”类新生成的链接提供给“get_docs”类。但是，我想不出有什么有效的方法可以做到这一点。我想做的就是在两个类之间建立连接，以便“web_parser”类生成链接，“get_docs”类处理它们以获得精炼的输出。任何有关我如何完美地做到这一点的想法都将受到高度赞赏。提前致谢。

from lxml import html
import requests

class web_parser:

    page_link = "https://www.yellowpages.com/search?search_terms=pizza&geo_location_terms=San%20Francisco%2C%20CA"
    main_url = "https://www.yellowpages.com"

    def __init__(self, link):

        self.link = link
        self.vault = []

    def parser(self):
        self.get_link(self.page_link)

    def get_link(self, url):

        page = requests.get(url)
        tree = html.fromstring(page.text)
        item_links = tree.xpath('//h2[@class="n"]/a[@class="business-name"][not(@itemprop="name")]/@href')
        for item_link in item_links:
            self.vault.append(self.main_url + item_link)


class get_docs(web_parser):

    def __init__(self, new_links):
        web_parser.__init__(self, link)
        self.new_links = [new_links]

    def procuring_links(self):
        for link in self.vault:
            self.using_links(link)


    def using_links(self, newly_created_link):

        page = requests.get(newly_created_link)
        tree = html.fromstring(page.text)
        name = tree.findtext('.//div[@class="sales-info"]/h1')
        phone = tree.findtext('.//p[@class="phone"]')
        print(name, phone)


if __name__ == '__main__':

    crawl = web_parser(web_parser.page_link)
    parse = get_docs(crawl)
    parse.parser()
    parse.procuring_links()

我对创建类知之甚少，所以请原谅我的无知。在此阶段执行时，我收到错误:

    web_parser.__init__(self, link)
NameError: name 'link' is not defined

Answer 1

我不太确定你想如何使用它，通过向 web_parser 提供参数或在类中使用硬编码链接？

根据您在 __main__ 中使用的命令，您可以进行如下处理:

class get_docs(object):

    def __init__(self, web_parser):
        self.vault = web_parser.vault


if __name__ == '__main__':

    crawl = web_parser() # create an instance
    crawl.parser()
    parse = get_docs(crawl)  # give the instance to get_doc, or directly the vault with crawl.vault
    parse.procuring_links()  # execute get_doc processing

__

您还需要更正 web_parser 类:

您必须在创建期间给定的参数 (link) 或硬编码的 page_link 之间进行选择，只需调整方法 parser() 来定位好的参数即可。

class web_parser:

    def __init__(self, link=''):

        self.link = link
        self.vault = []
        self.page_link = "https://www.yellowpages.com/search?search_terms=pizza&geo_location_terms=San%20Francisco%2C%20CA"
        self.main_url = "https://www.yellowpages.com"