Telling my code to generate all combinations of 00000 to 99999 but it doesn't?

You're confusing the difference between combination and product. Combinations preserve the order of the elements from a given set::

combinations_with_replacement('ABC', 2) --> AA AB AC BB BC CC

As you see in the example above, combinations does not give you BA, CA or CB.

It appears that you are looking for a product, which gives you back a Cartesian product with all elements regardless of their order.

product(range(2), repeat=3) --> 000 001 010 011 100 101 110 111

something like::

map(''.join, product(map(str, range(10)), repeat=5))

Use a cartesian product:

from itertools import product
one = [i for i in range(0,10)]
tmp = [one for i in range(5)]
combs = [i for i in product(*tmp)]