python [계산기]

class Calculation:
    #   [1] -------------------------------------------------------------
    def __init__(self):
        self.value1 = 0
        self.value2 = 0
    #   [2] -------------------------------------------------------------
    def summation(self):
        print("{0:d} + {1:d} = {2:d}"\
              .format(self.value1, self.value2, self.value1+self.value2))
    #   [3] -------------------------------------------------------------
    def subraction(self):
        print("{0:d} - {1:d} = {2:d}"\
              .format(self.value1, self.value2, self.value1+self.value2))
    #   [4] -------------------------------------------------------------
    def multiplication(self):
        print("{0:d} x {1:d} = {2:d}"\
              .format(self.value1, self.value2, self.value1*self.value2))

    #   [5] -------------------------------------------------------------
    def dividen(self):
        print("{0:d} / {1:d} = {2:.1f}"\
              .format(self.value1, self.value2, float(self.value1)/self.value2))

    #   [6]-------------------------------------------------------------
    def remainder(self):
        print("{0:d} % {1:d} = {2:d}"\
              .format(self.value1, self.value2, self.value1 % self.value2))

def main():
    study = Calculation
    study.value1 = int(input("study.value1 >>  "))
    study.value2 = int(input("study.value2 >>  "))

    study.summation(study)
    study.subraction(study)
    study.multiplication(study)
    study.dividen(study)
    study.remainder(study)

if __name__ == "__main__":
    main()