Design Mode learning-simple factory mode (python3) and design mode python3

Design Mode learning-simple factory mode (python3) and design mode python3

Reference Links: In the Python3 environment, debugging has implemented the simple factory mode in the big talk design mode. by defining a separate factory class, you can instantiate a specific product.

For specific implementation, see the code:

 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 = NumberA15         self.NumberB = NumberB16 17     def GetResult(self):18         pass19 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 = NumberA76         opType.NumberB = NumberB77 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 = ''