counting_change_comb.py

def count_change(money, available_coins, used_coins):
    if sum(used_coins) == money:
        yield used_coins
    elif sum(used_coins) > money:
        pass
    elif available_coins == []:
        pass
    else:
        for c in change(money, available_coins[:], used_coins+[available_coins[0]]): #multiple reccurencies
            yield c
        for c in change(money, available_coins[1:], used_coins): #stop picking coins
            yield c