设计模式学习-简单工厂模式（python3）
参考链接， 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
具体实现见代码：
1 #!/usr/bin/env python 2 # -*- coding: utf-8 -*- 3 # Date : 2017-10-15 21:46:28 4 # Author : John 5 # Version : V1.001 6 # Func : 7 8 9 class Operator(object): 10 """docstring for Operator""" 11 12 def __init__(self, NumberA=0, NumberB=0): 13 super(Operator, self).__init__() 14 self.NumberA = NumberA 15 self.NumberB = NumberB 16 17 def GetResult(self): 18 pass 19 20 21 class AddOp(Operator): 22 """docstring for AddOp""" 23 24 def GetResult(self): 25 return int(float(self.NumberA) + float(self.NumberB)) 26 27 28 class MinusOp(Operator): 29 """docstring for MinusOp""" 30 31 def GetResult(self): 32 return int(float(self.NumberA) - float(self.NumberB)) 33 34 35 class MultiOp(Operator): 36 """docstring for MultiOp""" 37 38 def GetResult(self): 39 return int(float(self.NumberA) * float(self.NumberB)) 40 41 42 class DivideOp(Operator): 43 """docstring for DivideOp""" 44 45 def GetResult(self): 46 try: 47 return float(float(self.NumberA) / float(self.NumberB) * 1.0) 48 except ZeroDivisionError as e: 49 print("DivideOp error, {0}".format(e)) 50 51 52 class OperatorFactory(object): 53 """docstring for OperatorFactory""" 54 55 def ChooseOperator(self, op): 56 if op == '+': 57 return AddOp() 58 if op == '-': 59 return MinusOp() 60 if op == '*': 61 return MultiOp() 62 if op == '/': 63 return DivideOp() 64 65 66 if __name__ == '__main__': 67 ch = '' 68 while not ch == 'q': 69 NumberA = input('Please input NumberA: ') 70 op = input('Please input operator: ') 71 NumberB = input('Please input NumberB: ') 72 73 factory = OperatorFactory() 74 opType = factory.ChooseOperator(op) 75 opType.NumberA = NumberA 76 opType.NumberB = NumberB 77 78 print('The result is: {0}'.format(opType.GetResult())) 79 print('\n#-- input q to exit any key to continue') 80 81 try: 82 ch = str(input()) 83 except Exception as e: 84 print('Get input error: {0}'.format(e)) 85 print('Use default value to ch') 86 ch = ''
