# Numbers in lists by SeanMc from forums
# define a procedure that takes in a string of numbers from 1-9 and
# outputs a list with the following parameters:
# Every number in the string should be inserted into the list.
# If a number x in the string is less than or equal 
# to the preceding number y, the number x should be inserted 
# into a sublist. Continue adding the following numbers to the 
# sublist until reaching a number z that
# is greater than the number y. 
# Then add this number z to the normal list and continue.

#Hint - "int()" turns a string's element into a number

def numbers_in_lists(string):
    masterlist, sublist = [int(string[0])], []
    highestnumber = int(string[0])
    for i in string[1:]:
        if int(i) <= highestnumber:
            sublist.append(int(i))
        else:
            if sublist:
                masterlist.append(sublist)
            masterlist.append(int(i))
            highestnumber = int(i)
            sublist = []
    if sublist:
        masterlist.append(sublist)
    return masterlist
    
    
        
string = '543987'
result = [5,[4,3],9,[8,7]]
print numbers_in_lists(string)
#testcases
string = '543987'
result = [5,[4,3],9,[8,7]]
print repr(string), numbers_in_lists(string) == result
string= '987654321'
result = [9,[8,7,6,5,4,3,2,1]]
print numbers_in_lists(string)
print repr(string), numbers_in_lists(string) == result
string = '455532123266'
result = [4, 5, [5, 5, 3, 2, 1, 2, 3, 2], 6, [6]]
print numbers_in_lists(string)
print repr(string), numbers_in_lists(string) == result
string = '123456789'
result = [1, 2, 3, 4, 5, 6, 7, 8, 9]
print numbers_in_lists(string)
print repr(string), numbers_in_lists(string) == result

Create numbersinlists.py