学步园

print "This program converts Fahrenheit to Celsius"
print "Type in a temperature in Fahrenheir:",
fahrenheir=float(raw_input())#使用float(raw_input())从用户得到温度（华氏）
celsius=(fahrenheir-32)*5.0/9
print "That is",celsius,"degrees Celsius"

运行结果：

>>> ================================ RESTART ================================
>>> 
This program converts Fahrenheit to Celsius
Type in a temperature in Fahrenheir: 89
That is 31.6666666667 degrees Celsius
>>> 

其实input()函数也能实现。但是Python的将来版本（3.0及以后版本）去除了input（）函数，只会有raw_input()。。。