python3设计模式之简单工厂模式

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 = ''

来源：http://www.cnblogs.com/skadieye/archive/2017/10/16/7676508.html