if结构

# -*- coding: utf-8 -*-
# @Author: Administrator
# @Date:   2018-05-19 08:31:31
# @Last Modified by:   Administrator
# @Last Modified time: 2018-05-19 08:38:54

people = 20
cats =30
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."

程序运行结果如下：

图1