笨办法学Python3 习题29和习题30

习题29

people = 20
cats = 20
dogs = 15


if people < cats:
    print("Too many cats! The world is doomed!")

if people > cats:
    print("Not many cats! The world is saved!")

if people < dogs:
    print("The world is drooled on!")

if people > dogs:
    print("The world is dry!")


dogs += 5

if people >= dogs:
    print("People are greater than or equal to dogs.")

if people <= dogs:
    print("People are less than or equal to dogs.")


if people == dogs:
    print("People are dogs.")

习题30

people = 30
cars = 40
buses = 15


if cars > people:
    print("We should take cars.")
elif cars < people:
    print("We should not take the cars.")
else:
    print("We can't decide.")

if buses > cars:
    print("That's too many buses.")
elif buses < cars:
    print("Maybe we could take the buses.")
else:
    print("We still can't decide.")

if people > buses:
    print("Alright, let's just take the buses.")
else:
    print("Fine, let's stay home then.")