D7net
Home
Console
Upload
information
Create File
Create Folder
About
Tools
:
/
proc
/
self
/
root
/
proc
/
self
/
root
/
lib
/
python3.6
/
site-packages
/
tuned
/
Filename :
patterns.py
back
Copy
class Singleton(object): """ Singleton design pattern. """ _instance = None def __init__(self): if self.__class__ is Singleton: raise TypeError("Cannot instantiate directly.") @classmethod def get_instance(cls): """Get the class instance.""" if cls._instance is None: cls._instance = cls() return cls._instance