Python 无法同时从两个不同的深度刮取不同的字段_Python_Python 3.x_Web Scraping

Python 无法同时从两个不同的深度刮取不同的字段

python python-3.x web-scraping

Python 无法同时从两个不同的深度刮取不同的字段,python,python-3.x,web-scraping,Python,Python 3.x,Web Scraping,我已经用python编写了一个脚本，从网页的登录页中刮取不同租户的姓名、地址和电话，并从每个餐厅内页解析作者和评论我想在获取附加信息（链接）函数中使用yield生成结果，但在获取链接（链接）函数中与其他结果一起打印相同的结果。到目前为止，我写过： import requests from bs4 import BeautifulSoup from urllib.parse import urljoin url = "https://www.yellowpages.com/search?s

我已经用python编写了一个脚本，从网页的登录页中刮取不同租户的

姓名

、

地址

和

电话

，并从每个餐厅内页解析

作者

和

评论

我想在
获取附加信息（链接）
函数中使用
yield
生成结果，但在
获取链接（链接）
函数中与其他结果一起打印相同的结果。

到目前为止，我写过：

import requests
from bs4 import BeautifulSoup
from urllib.parse import urljoin

url = "https://www.yellowpages.com/search?search_terms=restaurant&geo_location_terms=San+Francisco%2C+CA"
base = "https://www.yellowpages.com"

def get_links(link):
    res = requests.get(link,headers={'User-Agent':'Mozilla/5.0'})
    soup = BeautifulSoup(res.text,"lxml")
    for item in soup.select(".v-card"):

        inner_link = item.select_one("a.business-name")
        author,review = get_additional_info(urljoin(base,inner_link.get('href')))

        title = inner_link.text
        address = item.select_one("p.adr").get_text(strip=True)
        phone = item.select_one(".phone").text
        yield title,address,phone,author,review


def get_additional_info(link):
    res = requests.get(link,headers={'User-Agent':'Mozilla/5.0'})
    soup = BeautifulSoup(res.text,"lxml")
    for elem in soup.select("article[class='clearfix']"):
        try:
            author = elem.select_one(".review-info a.author").text
        except AttributeError: author = ""
        try:
            review = elem.select_one(".review-response > p").text
        except AttributeError: review = ""

        yield author, review

if __name__ == '__main__':
    for item in get_links(url):
        print(item)

如果我运行上述脚本，它将抛出以下错误，指向行

author，review=get\u additional\u info（urljoin（base，internal\u link.get（'href'））

：

回溯（最近一次呼叫最后一次）：
文件“C:\Users\WCS\AppData\Local\Programs\Python\Python37-32\demo.py”，第36行，在
对于get_链接（url）中的项目：
文件“C:\Users\WCS\AppData\Local\Programs\Python\Python37-32\demo.py”，第14行，在get\u链接中
作者，评论=获取附加信息（urljoin（基本，内部链接.get（'href'））
ValueError:要解压缩的值太多（应为2个）

我希望获取的所有字段都已正确定义（选择器）

这就是我所追求的：

PS我希望坚持我已经尝试过的方式，这意味着我不想解析来自内部页面的所有内容，因为数据对我来说是无用的

如果我理解正确，你想“加入”链接和其他信息。一种方法是：

import requests
from bs4 import BeautifulSoup
from urllib.parse import urljoin

from textwrap import shorten

url = "https://www.yellowpages.com/search?search_terms=restaurant&geo_location_terms=San+Francisco%2C+CA"
base = "https://www.yellowpages.com"

def get_links(session, link):
    res = session.get(link,headers={'User-Agent':'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0'})

    soup = BeautifulSoup(res.text,"lxml")
    for item in soup.select(".v-card"):

        inner_link = item.select_one("a.business-name")

        title = inner_link.text
        address = item.select_one("p.adr").get_text(strip=True)
        phone = item.select_one(".phone").text

        for author, review in get_additional_info(session, urljoin(base,inner_link.get('href'))):
            yield title,address,phone,author,review


def get_additional_info(session, link):
    res = session.get(link,headers={'User-Agent':'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0'})

    soup = BeautifulSoup(res.text,"lxml")
    for elem in soup.select("article[class='clearfix']"):
        try:
            author = elem.select_one(".review-info a.author").text
        except AttributeError: author = ""
        try:
            review = elem.select_one(".review-response > p").text
        except AttributeError: review = ""

        yield author, review

if __name__ == '__main__':
    with requests.session() as s:
        # this sets all cookies
        res = s.get("https://www.yellowpages.com", headers={'User-Agent':'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0'}).text

        for title,address,phone,author,review in get_links(s, url):
            print('{: <30}{: <30}{: <20}{: <20}{}'.format(shorten(title, 30), shorten(address, 30), shorten(phone, 20), shorten(author, 20), shorten(review, 60)))

get\u additional\u info（）

函数返回一个生成器；您必须使用此生成器才能获取项目，或者如果不需要生成器，请更改函数以返回这些项目。我是否可以在

get\u additional\u info（）

函数中返回所有这些项目，并在

get\u links（link）

中打印相同的项目？如果我按原样返回值，函数将只记住最后一次迭代。你可以在列表中添加所有项，但可以避免。为了打开发电机的包装，您必须知道它将返回多少物品，这在这种情况下可能是不可能的。相反，你可以做的是迭代生成器并打开每个项目，就像Andrej的回答中所做的那样。非常感谢，先生@t.m.adam。这就是我需要知道的。您可以将get_链接（s，url）中标题、地址、电话、作者、评论的

缩短为仅get_链接（s，url）中标题的：，这仍然会产生相同的结果。
import requests
from bs4 import BeautifulSoup
from urllib.parse import urljoin

from textwrap import shorten

url = "https://www.yellowpages.com/search?search_terms=restaurant&geo_location_terms=San+Francisco%2C+CA"
base = "https://www.yellowpages.com"

def get_links(session, link):
    res = session.get(link,headers={'User-Agent':'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0'})

    soup = BeautifulSoup(res.text,"lxml")
    for item in soup.select(".v-card"):

        inner_link = item.select_one("a.business-name")

        title = inner_link.text
        address = item.select_one("p.adr").get_text(strip=True)
        phone = item.select_one(".phone").text

        for author, review in get_additional_info(session, urljoin(base,inner_link.get('href'))):
            yield title,address,phone,author,review


def get_additional_info(session, link):
    res = session.get(link,headers={'User-Agent':'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0'})

    soup = BeautifulSoup(res.text,"lxml")
    for elem in soup.select("article[class='clearfix']"):
        try:
            author = elem.select_one(".review-info a.author").text
        except AttributeError: author = ""
        try:
            review = elem.select_one(".review-response > p").text
        except AttributeError: review = ""

        yield author, review

if __name__ == '__main__':
    with requests.session() as s:
        # this sets all cookies
        res = s.get("https://www.yellowpages.com", headers={'User-Agent':'Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0'}).text

        for title,address,phone,author,review in get_links(s, url):
            print('{: <30}{: <30}{: <20}{: <20}{}'.format(shorten(title, 30), shorten(address, 30), shorten(phone, 20), shorten(author, 20), shorten(review, 60)))

El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294      Mark I.             Their food is good but i think they need to improve on [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294      Cathy L.            This place is pretty much my go to place is I want [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294      Mary C.             They have so many things in here worth going in here [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294      Claude R.           The appetizers in here are enough to make you ask for [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294      Felicia M.          How can this be? This place looks like magic and their [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294      Jose H.             I feel like I just got from Mexico, we went here last [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          Authentic Mexican. Always busy and the house salsa is [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          I'm disappointed. The decor is ecclectic and fun, the [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          This used to be one of my favorite restaurants until I [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          I came to this restarnt for a birthday of a friend of [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          The reviews here, which I consulted before going, were [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          I have been told to give it a try.Food is on [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          Great food... love the empalmada... sort of like a [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          Definitely the best Mexican restaurant in town!... [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          This place has been consistenly good for a few years. [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          So-so Mexican food served by a vaguely condescending, [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          since the place is small, it gets crowded quickly and [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          Go early if you don't want to wait. They don't take [...]
El Toreador Restaurant        50 W Portal Ave, San [...]    (415) 347-3294                          A great place where you belong like part of the [...]
House Of Prime Rib            1906 Van Ness Ave, San [...]  (415) 636-6476      Keith Y.            Loved this place. Food and service was amazing
House Of Prime Rib            1906 Van Ness Ave, San [...]  (415) 636-6476      Quintrell P.        Was really hungry and needed a place to get some [...]
House Of Prime Rib            1906 Van Ness Ave, San [...]  (415) 636-6476      Len K.              I'm not usually a fan of red meat, but I'm definitely [...]
House Of Prime Rib            1906 Van Ness Ave, San [...]  (415) 636-6476      Emm C.              I haven't been able to see San Francisco, one of my [...]
House Of Prime Rib            1906 Van Ness Ave, San [...]  (415) 636-6476      James O.            For me, it`s one of the best ribs in town, I give [...]
House Of Prime Rib            1906 Van Ness Ave, San [...]  (415) 636-6476      Jing H.             This is one of the best places if you are craving for [...]

...etc.