BeautifulSoup img src获取base64而不是实际链接

Question

我是使用bs4进行网络抓取的新手，我想从蛋白质数据库（PDB）获取蛋白质的图像：

https://www.rcsb.org/structure/1A69

[当我用Chrome Inspector检查HTML时，我看到图像是通过http链接获得的，我可以轻松地转到该链接并保存该图像。

<img class="img-responsive center-block mainImage" 
     src="https://cdn.rcsb.org/images/rutgers/a6/1a69/1a69.pdb1-500.jpg">

但是，当我运行脚本以提取src时，我只能将其作为base64。

data:image/gif;base64,R0lGODlhAQABAAD/ACwAAAAAAQABAAACADs=

我做错什么了吗？发生了什么？有没有办法从base64取回http链接？

我的代码：

from bs4 import BeautifulSoup as bs
from urllib.request import urlopen

url = "https://www.rcsb.org/structure/1A69"
resp = urlopen(url)
page = bs(resp,"html.parser")

for img in page.findAll('img',{'class':'img-responsive'}):
    src = img['src']
    print(src)

Answer 1

图像URL由JavaScript动态组成，但是您可以通过此Python脚本来模拟组成：

import requests
from bs4 import BeautifulSoup

url = 'https://www.rcsb.org/structure/1A69'
soup = BeautifulSoup(requests.get(url).content, 'html.parser')
pdb_id = url.split('/')[-1].lower()
images_location = "https://cdn.rcsb.org/images/rutgers/"
num_items = len( soup.select('#carousel-structuregallery .item') )
pdb_hash = pdb_id[1:3]

# print image urls to screen:

for i in range(num_items):
    # 0 = Asymmetric; 1+ = Biological Assembly
    if i == 0:
        img_url = images_location + pdb_hash + '/' + pdb_id + '/' + pdb_id + '.pdb-500.jpg'
    else:
        img_url = images_location + pdb_hash + '/' + pdb_id + '/' + pdb_id + '.pdb' + str(i) + '-500.jpg'
    print(img_url)

打印：

https://cdn.rcsb.org/images/rutgers/a6/1a69/1a69.pdb-500.jpg
https://cdn.rcsb.org/images/rutgers/a6/1a69/1a69.pdb1-500.jpg

Answer 2

import requests as re
from bs4 import BeautifulSoup as bs
from urllib.request import urlopen
url = "https://www.rcsb.org/structure/1A69"
resp = urlopen(url)
soup = bs(resp, 'html.parser')
images = []
for img in soup.findAll('img'):
    images.append(img.get('src'))

for i in images:
     i = 'http:' + i
    try:
        response = re.get(i)
        if response.status_code == 200:
            print(i)
    except:
        continue

输出：

http://files.rcsb.org/pub/pdb/validation_reports/a6/1a69/1a69_multipercentile_validation.png
http://cdn.rcsb.org/rcsb-pdb/explorer/SSPv2/images/MendeleyIcon.png
http://cdn.rcsb.org/rcsb-pdb/explorer/SSPv2/images/EndNoteIcon.png
http://cdn.rcsb.org/images/ccd/unlabeled/F/FMB.svg
http://cdn.rcsb.org/images/ccd/unlabeled/S/SO4.svg
http://files.rcsb.org/pub/pdb/validation_reports/a6/1a69/1a69_multipercentile_validation.png