python3设计模式之简单工厂模式_Python

python3设计模式之简单工厂模式

2020-12-11 00:42skadieye Python

这篇文章主要为大家详细介绍了python3设计模式之简单工厂模式，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

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 = ''