Python小案例：小计算器

import sys
import json
'''
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'''
print('--------------Welcome to the four computing device---------')
a=int(raw_input('please input num1:'))
b=int(raw_input('num2:'))
print 'result in the follow:','\n','num1+num2='+str(a+b),'\n','num1-num2='+str(a-b) ,'\n','num1*num2='+str(a*b),'\n','num1/num2='+str(a/b),'\n',

实战二：计算园的周长和面积

import math  
radius=input("radius of cricle:")  
circumference=2*math.pi*radius  
area=math.pi*radius*radius  
print ( "circumference of circle: %.2f" % circumference)  
print ( "area of cricle: %.2f"% area)