python第二章课后题答案

这是第二章的习题解答，可能题目的序号有一点错位，改天再修改吧

# 2.1

from __future__ import division

Celsius =eval(raw_input("Enter a degree in Celsius: "))

fahrenheit = (9/5)*Celsius+32

print Celsius , "Celsius is", fahrenheit ,"Fahrenheit"

# 2.2

import math

from __future__ import division

radius,length = eval(raw_input("Enter the radius and length of a sylinder:"))

area = radius*radius*math.pi

volume = area*length

print "The area is",area

print "The volume is",volume

# 2.3

from __future__ import division

mile = eval(raw_input("Enter the value for feet:"))

meter = mile*0.305

# print mile,"feet is",meter,"meters"

print " %.2f feet is %.2f meters" % (mile,meter)

# 2.4

from _