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| Voyez aussi http://c2.com/cgi/wiki?PythonSingleton | See also http://c2.com/cgi/wiki?PythonSingleton |
Singleton
See also http://c2.com/cgi/wiki?PythonSingleton
classmethod
pro
- You can use both as simple class or as a singleton.
- You do not need to write code for each class you want to act as singleton.
cons
1 # Code is Public Domain.
2 class Singleton:
3 _singleton = None
4
5 def getSingleton(cls):
6 if not Singleton._singleton:
7 Singleton._singleton = cls()
8 return Singleton._singleton
9
10 getSingleton = classmethod(getSingleton)
11
12
13 class Test(Singleton):
14 def test(self):
15 print self.__class__,id(self)
16
17
18 t1 = Test.getSingleton()
19 t2 = Test.getSingleton()
20
21 t1.test()
22 t2.test()