people = 30
cars   = 40
buses  = 15

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

if buses > cars:
    print("That't too many buses.")
elif buses < cars:
    print("Maybe we could take 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.")

# 加分习题
'''
1.猜想一下 elif 和 else 的功能。
2.将 cars, people, 和 buses 的数量改掉，然后追溯每一个 if 语句。看看最后会 打印出什么来。
3.试着写一些复杂的布尔表达式，例如 cars > people and buses < cars。
4.在每一行的上面写注解，说明这一行的功用。
'''