Introduction to the simple factory pattern of python3-Python Tutorial-php.cn

Introduction to the simple factory pattern of python3

黄舟

Release： 2017-10-17 10:23:40

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This article mainly introduces the simple factory pattern of python3 design pattern in detail, which has certain reference value. Interested friends can refer to it

In the Python3 environment, debugging is implemented " The simple factory pattern in "Dahua Design Pattern" completes the instantiation of specific products by defining a separate factory class. Reference link

See the code for specific implementation:

#!/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 pideOp(Operator):
 """docstring for pideOp"""

 def GetResult(self):
 try:
  return float(float(self.NumberA) / float(self.NumberB) * 1.0)
 except ZeropisionError as e:
  print("pideOp error, {0}".format(e))


class OperatorFactory(object):
 """docstring for OperatorFactory"""

 def ChooseOperator(self, op):
 if op == &#39;+&#39;:
  return AddOp()
 if op == &#39;-&#39;:
  return MinusOp()
 if op == &#39;*&#39;:
  return MultiOp()
 if op == &#39;/&#39;:
  return pideOp()


if __name__ == &#39;__main__&#39;:
 ch = &#39;&#39;
 while not ch == &#39;q&#39;:
 NumberA = input(&#39;Please input NumberA: &#39;)
 op = input(&#39;Please input operator: &#39;)
 NumberB = input(&#39;Please input NumberB: &#39;)

 factory = OperatorFactory()
 opType = factory.ChooseOperator(op)
 opType.NumberA = NumberA
 opType.NumberB = NumberB

 print(&#39;The result is: {0}&#39;.format(opType.GetResult()))
 print(&#39;\n#-- input q to exit any key to continue&#39;)

 try:
  ch = str(input())
 except Exception as e:
  print(&#39;Get input error: {0}&#39;.format(e))
  print(&#39;Use default value to ch&#39;)
  ch = &#39;&#39;

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