习题 29 if 语句

# ex29.py

people = 20
cats = 30
dogs = 15

if people < cats:
    print "Too many cats! The world is deoomed!"

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."

结果：

$ python ex29.py
Too many cats! The world is deoomed!
The world is dry!
People are greater than or equal to dogs.
People are less than or equal to dogs.
People are dogs.