Decorator for singleton classes

singleton_decorator.py

def singleton(cls):
    """
    Provide a decorator for the Singleton pattern
 
    """
    instances = {}
 
    def getinstance():
        if cls not in instances:
            instances[cls] = cls()
        return instances[cls]
 
    #Ensure that docstrings are passed on
    getinstance.__doc__ = cls.__doc__
    getinstance.__repr__ = cls.__repr__
 
    return getinstance

@singleton
class MyClass():
    """
    This is my Singleton class.
 
    Usage:
 
        >>> a = MyClass()
        >>> b = MyClass()
        >>> print (a == b)
        True
 
    """
    pass