try:
		inf2 = open(fname, "r")

		for line in inf2:
			cols = line.split()
			#print line
			if(len(cols)>=3):
				if(cols[2]=="1"):	continue
			url = cols[0]
			#print "original url = "+url
						

			url = url.replace(".", "/")
			if url[-1]=="/": url=url[:-1]
			urlparts = url.split("/")
			partsno =len(urlparts)
			#prepare each pars for re operation
	
			...
		inf2.close() 
	except IOError:                     
		print "The file does not exist, goto the next file"