Need help specifying a ending while condition

Posted by johnthexiii on Stack Overflow See other posts from Stack Overflow or by johnthexiii
Published on 2011-06-05T03:40:32Z Indexed on 2012/07/08 3:16 UTC
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I have written a Python script to download all of the xkcd comic images. The only problem is I can't tell it to stop when it gets to the last one... Here is what I have so far.

import re, mechanize
from urllib import urlretrieve
from BeautifulSoup import BeautifulSoup as bs

baseUrl = "http://xkcd.com/1/" #Specify the first comic page
br = mechanize.Browser() #Create a browser

response = br.open(baseUrl) #Create an initial response

x = 1 #Assign an initial file name
while (SomeCondition):
    soup = bs(response.get_data()) #Create an instance of bs that contains the response data
    img = soup.findAll('img')[1] #Get the online file path of the image
    localFile = "C:\\Comics\\xkcd\\" + str(x) + ".jpg"  #Come up with a local file name
    urlretrieve(img["src"], localFile) #Download the image file
    response = br.follow_link(text = "Next >") #Store the response of the next button
    x += 1 #Increase x by 1
print "All xkcd comics downloaded" #Let the user know the images have been downloaded

Initially what I had was something like

while br.follow_link(text = "Next >") != br.follow_link(text = ">|"):

but by doing this I actually send skip to the last page before the script has a chance to perform the intended purpose.

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