python3设计模式之简单工厂模式

  • Z时代
  • 2024-01-10
  • 分类：综合

在Python3环境下，调试实现了《大话设计模式》中简单工厂模式，通过定义单独的工厂类，完成对具体的产品的实例化,参考链接

具体实现见代码：

#!/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):
 pass
class 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 = ''

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