#coding=utf-8
#raw_input()函数输出的数据是"str",需要将其处理成数据，使用int()函数，将“str"转换成数据来处理
students = int(raw_input("students number"))
fees_per_person = 80
cost = students * 3
total_income = students * fees_per_person
total_profit = total_income - cost
print "Our total_income is : %d." % total_income
print "Our total_profit is : %d." % total_profit
if total_profit > 1000:
print "\tWe are making big money now."
if total_profit > 5000:
print "\tWe are making super money now."
if total_profit <= 10000:
print "\tWe still need to work harder, to make more money."
if total_profit >= 10000:
print "We don‘t need to work for the rest of the life."
Python_if语句。 Learn python the hard way_扩展练习。习题29
原文：http://www.cnblogs.com/patrickyuan/p/6500586.html