128

colors = ("green","blue","red","gold","white","gray")

for c in basket_1.balloon_colors:

    if c not in colors:

        basket_1.balloon_colors.remove(c)

# Remove the colors from basket_2 that are not in

# the tuple: colors

for c in basket_2.balloon_colors:

    if c not in colors:

        basket_2.balloon_colors.remove(c)

for c in colors:

    basket_3.balloon_colors.add(c)

    # Add colors from the tuple: colors to basket_4

    basket_4.balloon_colors.add(c)