如何在网页上抓取隐藏在选择选项下的PDF

Question

我正在尝试下载>使用python的网站提供的100 pdf。但是，这些pdf隐藏在选择选项下。例如：

• 选项1
• 选项2
• 选项3

然后，如果我选择选项1，我会撒谎：

• 选项1
  • 可点击的信息链接1〔可点击的文件链接1〕
  • 可点击的信息链接2[可点击的文件链接2]
  • 信息3的可点击链接[文件3的可单击链接]
  • 可点击的信息链接4[可点击的文件链接4]
• 选项2
• 选项3

一旦我按下，例如，"；指向文件1的可点击链接"；，图片弹出并带有"；查看PDF"；在弹出窗口的右上角。现在，我如何为选项1下的每个文件循环下载PDF？我是网络聊天的新手，非常感谢你的帮助。

谢谢！

Answer 1

似乎可以根据链接标识符自动构建PDF Url。例如：

import requests
from bs4 import BeautifulSoup
url = "https://www12.statcan.gc.ca/census-recensement/2016/dp-pd/prof/search-recherche/lst/results-resultats.cfm?Lang=E&TABID=1&G=1&Geo1=&Code1=&Geo2=&Code2=&GEOCODE=35&type=0"
map_url = "https://www12.statcan.gc.ca/census-recensement/geo/maps-cartes/pdf/{id1}/{id2}.pdf"
soup = BeautifulSoup(requests.get(url).content, "html.parser")
for a in soup.select("a[data-dguid]"):
id_ = a["data-dguid"]
m = map_url.format(id1=id_[4:9], id2=id_)
print("{:<60} {}".format(a["data-geoname"], m))

打印：

...
Map: Arthur [Population center], Ontario                     https://www12.statcan.gc.ca/census-recensement/geo/maps-cartes/pdf/S0510/2016S05100022.pdf
Map: Atikokan [Population center], Ontario                   https://www12.statcan.gc.ca/census-recensement/geo/maps-cartes/pdf/S0510/2016S05100028.pdf
Map: Attawapiskat 91A [Population center], Ontario           https://www12.statcan.gc.ca/census-recensement/geo/maps-cartes/pdf/S0510/2016S05101497.pdf
Map: Aylmer [Population center], Ontario                     https://www12.statcan.gc.ca/census-recensement/geo/maps-cartes/pdf/S0510/2016S05100030.pdf
Map: Ayr [Population center], Ontario                        https://www12.statcan.gc.ca/census-recensement/geo/maps-cartes/pdf/S0510/2016S05100031.pdf
Map: Azilda [Population center], Ontario                     https://www12.statcan.gc.ca/census-recensement/geo/maps-cartes/pdf/S0510/2016S05101498.pdf
Map: Ballantrae [Population center], Ontario                 https://www12.statcan.gc.ca/census-recensement/geo/maps-cartes/pdf/S0510/2016S05101370.pdf
Map: Barrie [Population center], Ontario                     https://www12.statcan.gc.ca/census-recensement/geo/maps-cartes/pdf/S0510/2016S05100043.pdf
Map: Barry's Bay [Population center], Ontario                https://www12.statcan.gc.ca/census-recensement/geo/maps-cartes/pdf/S0510/2016S05100044.pdf
Map: Bath [Population center], Ontario                       https://www12.statcan.gc.ca/census-recensement/geo/maps-cartes/pdf/S0510/2016S05101403.pdf
...