python 下载xkcd网站上的部分图片 脚本

soup = bs4.BeautifulSoup(res.text)

# Find the URL of the comic image.
comicElem = soup.select('#comic img')
if comicElem == []:
    print('Could not find comic image.')
else:
    comicUrl = comicElem[0].get('src')
    # Download the image.
    print('Downloading image %s...' % (comicUrl))
    res = requests.get(comicUrl)
    res.raise_for_status()

    # Save the image to ./xkcd
    imageFile = open(os.path.join('xkcd', os.path.basename(comicUrl)), 'wb')
    for chunk in res.iter_content(100000):
        imageFile.write(chunk)
    imageFile.close()

# Get the Prev button's url.
prevLink = soup.select('a[rel="prev"]')[0]
url = 'http://xkcd.com' + prevLink.get('href')