class

#-*- coding: utf-8 -*-
class Inf:
    def __init__(self):
        self.numList = [] # empty
        self.summation = 0
        self.average_float = 0.0
    def inputData(self):
        for i in range(0, 3): # 0,1,2
            self.numList.append(int(input("[{}] data input    ".format(i)))) # 이 표현 중요하게 보자
    def addition(self):
        self.summation = sum(self.numList)
        print " summation is {} ".format(self.summation)
    def ave(self):
        self.average_float = self.summation/3
        print " average is {} ".format(self.average_float)
def main():
    stu = Inf()
    stu.inputData()
    stu.addition()
    stu.ave()
if __name__ == "__main__":
    main()