Example of singleton class

single.py

"""
Is this a good idea?

https://stackoverflow.com/questions/6760685/creating-a-singleton-in-python

"""
class Singleton:
   __instance = None
   
   @staticmethod 
   def getinstance():
      """Static access method."""
      if Singleton.__instance == None:
         Singleton()
      return Singleton.__instance
   
   def __init__(self):
      """Virtually private constructor."""
      if Singleton.__instance is not None:
         raise Exception("This class is a singleton!")
      else:
         Singleton.__instance = self
         

s = Singleton()
print(s)

t = Singleton()
print(t)