fork download
copy 
  1. #!/usr/bin/env python3
  2.  
  3. from abc import ABCMeta, abstractmethod
  4. import datetime
  5.  
  6. class DBint(metaclass=ABCMeta):
  7.     @abstractmethod
  8.     def getData(self):
  9.         pass
  10.  
  11. class DB(DBint):
  12.     def getData(self):
  13.         return 'private data'
  14.  
  15. class Proxy(DBint):
  16.     def __init__(self, db):
  17.         self.db = db
  18.  
  19.     def getData(self):
  20.         self.writeLog()
  21.         return self.db.getData()
  22.  
  23.     def writeLog(self):
  24.         print('request data in:', datetime.datetime.now())        
  25.  
  26. class User:
  27.     def __init__(self, dataObj):
  28.         self.dataObj = dataObj
  29.  
  30.     def requestData(self):
  31.         return self.dataObj.getData()
  32.  
  33.  
  34. db = DB()
  35. user1 = User(db)
  36. print(user1.requestData())
  37.  
  38. proxy = Proxy(db)
  39. user2 = User(proxy)
  40. print(user2.requestData())
  41.  
Success #stdin #stdout 0.02s 27984KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
private data
request data in: 2019-03-13 17:44:32.732876
private data
https://ideone.com/KrtpqK
language:
Python 3 (python  3.12)
created:
7 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!