Akanksha Govil wrote: > I need to implement a singleton class in python. > Please give me some refernce sites which can help me with the same.
Singletons are not used that much in Python, perhaps because the general culture of "we're all adults here" is biased against enforcing usage patterns. If you want to have a master reference to an object you can just make it a module attribute. Then any client that needs access to the object just imports the module. Why do you need a singleton? Is this homework? > Also i want to know to call a destructor for a singleton class. In Python, destructors (__del__() methods) are called on an object when it is garbage-collected. The details of when this happens vary between different Python implementations. In CPython (the standard Python from python.org), an object is garbage-collected when its reference count goes to 0 - when there are no names that refer to the object. So if you want the __del__() method of an object to be called, you have to ensure that there are no references to the object. In the case of a singleton, this would mean deleting or assigning None to the name that holds the master reference, and ensuring that no users of the singleton retain references to it. Kent _______________________________________________ Tutor maillist - [email protected] http://mail.python.org/mailman/listinfo/tutor
