gistfile1.py

import urllib 
import os

dirlist = ['dsintro', 'socketbasedds', 'remotecalls','distributedobjects', 'distributedservices1', 'distributedservices2', 'security1', 'components', 'systemmanagement', 'designissues', 'webservices', 'peertopeer', 'soa', ]

for dir in dirlist:
	i=1
	for i in range(1,100):
		try:
			print '** Processing : ' + dir + ' Slide#: ' + str(i)
			page = urllib.urlopen('http://www.kriha.de/krihaorg/docs/lectures/distributedsystems/'+ dir + '/pictures/Folie'+str(i)+'.PNG').read()
			
			if '404 Not Found' in page: 
				print '** No more slides here, moving on...'
				break	
			else:	
				f = open(str(dirlist.index(dir)) + '-' + dir + '_slide'+str(i)+'.png','w')
				f.write(page)
		except: 
			print '** Error, something went wrong..'