A better method of generating Yahtzee-ish dice possibilities in Python

dice.py

from itertools import product
 
def iterate_dice_simple(diceNums, diceToHold):
    roles = list(product(range(1, 7), repeat=len(diceNums)))
    return [r for r in roles if has_held_dice(r, diceNums, diceToHold)]
  
def has_held_dice(r, diceNums, diceToHold):
    for i in range(len(diceToHold)):
        if diceToHold[i] == 0: continue
        if r[i] != diceNums[i]: return False
    return True
 
print iterate_dice_simple([3, 5, 4], [0, 1, 1])