Create dictionary based of x items per key from two lists

[Jason Friedman]

> I have two lists
>
> l1 =  ["a","b","c","d","e","f","g","h","i","j"]
> l2 = ["aR","bR","cR"]
>
> l2 will always be smaller or equal to l1
>
> numL1PerL2 = len(l1)/len(l2)
>
> I want to create a dictionary that has key from l1 and value from l2 based on numL1PerL2
>
> So
>
> {
> a:aR,
> b:aR,
> c:aR,
> d:bR,
> e:bR,
> f:bR,
> g:cR,
> h:cR,
> i:cR,
> j:cR
> }

Another possibility is:
import itertools
my_dict = {x:y for x,y in zip(list1, itertools.cycle(list2))}