问题描述
我正在尝试使用 python 从网站下载 >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 ...
那么,如果我选择选项 1,我会撒谎:
- 选项 1
- 选项 2
- 选项 3
一旦我按下,例如“文件 1 的可点击链接”,就会弹出图片,并在弹出窗口的右上角显示“查看 PDF”的选项。现在如何为选项 1 下的每个文件循环下载 PDF?我是网络抓取的新手,非常感谢您的帮助。
谢谢!
解决方法
看来您可以自动从链接标识符构造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
...