习题 30 else 和 if

# ex30.py

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'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."

结果：

$ python ex30.py
We should take the cars.
Maybe we could take the buses.
Alright, let's just take the buses.

Python 的规则是，只要一行以冒号（:）结尾，它接下来的内容就应该有缩进。