from random import randint

def make_fair_dice(sides):
    """Return a die that returns 1 to SIDES with equal chance."""
    assert type(sides) == int and sides >= 1, 'Illegal value for sides'
    def dice():
        return randint(1,sides)
    return dice

four_sided_dice = make_fair_dice(4)
six_sided_dice = make_fair_dice(6)

def roll_dice(num_rolls, dice=six_sided_dice, who='Boss Hogg'):
    """Calculate WHO's turn score after rolling DICE for NUM_ROLLS times.

    num_rolls:  The number of dice rolls that will be made; at least 1.
    dice:       A function of no args and returns an integer outcome.
    who:        Name of the current player, for commentary.
    """
    assert type(num_rolls) == int, 'num_rolls must be an integer.'
    assert num_rolls > 0, 'Must roll at least once.'
    k, total = 1, 0
    while k <= num_rolls:
        k += 1
        x = dice()
        print(who, "rolled a", x)
        if x == 1:
            total = 1
        elif total == 1:
            total = 1 + 0
        else:
            total = total + x
    return total
roll_dice(4)