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import requests, os, bs4, re
from IPython.display import Image

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# Starting url
url = 'http://xkcd.com'
# Store comics in ./xkcd
# makedirs() ensures the folder exists
# exist_ok=True prevents function from throwing exception if folder already exists
# Python3: os.makedirs('xkcd', exist_ok=True)
os.makedirs('xkcd' ,exist_ok = True)

last_comic = 1732 - int(input("Enter number of comics: "))
# End loop when url ends with '#'
while not url.endswith(str(last_comic)+'/'):
    # Download the page
    print ('Downloading page %s...'% url)
    res = requests.get(url)
    soup = bs4.BeautifulSoup(res.text, 'html.parser')

    # Find the URL of the comic image
    # <div id="comic"><img src=""></div>
    comicElem = soup.select('#comic img')
    if comicElem == []:
        print ('Could not find comic image.')
        # Create regex to parse url below the comic (remember to escape the parentheses)
        pattern = re.compile(r'Image URL \(for hotlinking/embedding\): (.*)')
        # Pass pattern to BeautifulSoup's find() method
        comicUrl = soup.find(text=pattern)
        # Substitute with r'\1', the first group in parentheses: (.*)
        # Use strip to remove whitespace
        comicUrl = pattern.sub(r'\1', comicUrl).strip()
        # Download the image
        print ('Downloading the image %s...'% comicUrl)
        Image(url= comicUrl)

        res = requests.get(comicUrl)

        # Save the image to ./xkcd
        # comicUrl example: http://imgs.xkcd.com/comics/heartbleed_explanation.png
        # call os.path.basename() on it to return the last part of the url:
        # heartbleed_explanation.png (can use this as the filename of image when saving)
        # join() so program uses backslashes on Windows and forward clashes on OS X and Linux
        # call open() to open a new file in 'wb' "write binary" mode
        # to save downloaded files using Requests, loop over return value of the iter_content()
        # for loop writes chunks of the image data (max 100,000 bytes each) to the file
        # then close the file, the image is now saved your hard drive
        imageFile = open(os.path.join('xkcd', os.path.basename(comicUrl)), 'wb')
        for chunk in res.iter_content(100000):

    # Get the Prev button's url
    # while loop begins the entire download process again for this comic
    prevLink = soup.select('a[rel="prev"]')[0]
    url = 'http://xkcd.com' + prevLink.get('href')

print ('Done.')

Enter number of comics: 3
Downloading page http://xkcd.com...
Downloading the image http://imgs.xkcd.com/comics/earth_temperature_timeline.png...
Downloading page http://xkcd.com/1731/...
Downloading the image http://imgs.xkcd.com/comics/wrong.png...
Downloading page http://xkcd.com/1730/...
Downloading the image http://imgs.xkcd.com/comics/starshade.png...

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