练习27~30——判断，布尔值，if&else

27：判断关系

and 与

or 或

not 非

!= (not equal) 不等于

== (equal) 等于

>= (greater-than-equal) 大于等于

<= (less-than-equal) 小于等于

28：判断关系得到布尔值

True 真

False 假

29：if语句

30：if else

# coding:utf-8
# ex 30

people = 30
cars = 40
buses = 15

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

if buses > cars:
print ("That's too many buses.")
elif buses < cars:
print ("Maybe we should 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.")