Bottle of Beer 2.0

bobotw = " bottles of beer on the wall"
bob = " bottles of beer."
take = "Take one down and pass it around, "
beer = 99

def on_wall(beer):
    if beer == 0:
        print("No more" + bobotw + ", no more" + bob)
        print("Go to the store and buy some more, 99" + bobotw + ".")
        return
    elif beer == 1:
        print(str(beer) + " bottle of beer on the wall, " + str(beer) + " bottle of beer.")
        beer -= 1
        print(take + "no more" + bobotw + ".")
    elif beer == 2:
        print(str(beer) + bobotw + ", " + str(beer) + bob)
        beer -= 1
        print(take + "only one bottle of beer on the wall.")
    else:
        print(str(beer) + bobotw + ", " + str(beer) + bob)
        beer -= 1
        print(take + str(beer) + bobotw + ".")
    on_wall(beer)

answer = input("Do you want to see the Bottles of Beer song? (y/n) : ")

if answer.lower() == "y":
    on_wall(beer)
elif answer.lower() == "n":
    print("Bollocks to ya then.")
else:
    print("It's y for yes, n for no.")