python3设计模式之简单工厂模式

#!/usr/bin/env python# -*- coding: utf-8 -*-# Date : 2017-10-15 21:46:28# Author : John# Version : V1.001# Func :class Operator(object): """docstring for Operator""" def __init__(self, NumberA=0, NumberB=0): super(Operator, self).__init__() self.NumberA = NumberA self.NumberB = NumberB def GetResult(self): passclass AddOp(Operator): """docstring for AddOp""" def GetResult(self): return int(float(self.NumberA) + float(self.NumberB))class MinusOp(Operator): """docstring for MinusOp""" def GetResult(self): return int(float(self.NumberA) - float(self.NumberB))class MultiOp(Operator): """docstring for MultiOp""" def GetResult(self): return int(float(self.NumberA) * float(self.NumberB))class DivideOp(Operator): """docstring for DivideOp""" def GetResult(self): try:  return float(float(self.NumberA) / float(self.NumberB) * 1.0) except ZeroDivisionError as e:  print("DivideOp error, {0}".format(e))class OperatorFactory(object): """docstring for OperatorFactory""" def ChooseOperator(self, op): if op == '+':  return AddOp() if op == '-':  return MinusOp() if op == '*':  return MultiOp() if op == '/':  return DivideOp()if __name__ == '__main__': ch = '' while not ch == 'q': NumberA = input('Please input NumberA: ') op = input('Please input operator: ') NumberB = input('Please input NumberB: ') factory = OperatorFactory() opType = factory.ChooseOperator(op) opType.NumberA = NumberA opType.NumberB = NumberB print('The result is: {0}'.format(opType.GetResult())) print('/n#-- input q to exit any key to continue') try:  ch = str(input()) except Exception as e:  print('Get input error: {0}'.format(e))  print('Use default value to ch')  ch = ''