Answer for http://stackoverflow.com/questions/13421874/ordered-list-of-lists/13421976

q13421874.py

list_of_lists=[]
category=0
list_of_lists.append([])

f = open("list.txt",'r')

for line in f.readlines():
    item = line.strip('\n') # no white spaces in the list
    if len(item) > 0:
         #add to current category
         list_of_lists[category].append(item)
    else: 
         #add new category
         list_of_lists.append([])
         category = category + 1
f.close()

print(list_of_lists)