looking for a neat solution to a nested loop problem

[Tom P]

consider a nested loop algorithm -

for i in range(100):
     for j in range(100):
         do_something(i,j)

Now, suppose I don't want to use i = 0 and j = 0 as initial values, but 
some other values i = N and j = M, and I want to iterate through all 
10,000 values in sequence - is there a neat python-like way to this? I 
realize I can do things like use a variable for k in range(10000): and 
then derive values for i and j from k, but I'm wondering if there's 
something less clunky.