dp0_singleton_pattern.py

class SingleTonPattern:
    _instance = None

    def __new__(cls, name, *args, **kwargs):
        if cls._instance is None:
            print(f'Creating Instance.')
            cls._instance = object.__new__(cls, *args, **kwargs)
        return cls._instance

    def __init__(self, name, *args, **kwargs):
        print(f"__init__ method called {name}")

    def __del__(self):
        print(f"Deleting an instance")
        self._instance = None

def main():
    obj = SingleTonPattern('obj')
    print(f'created object {obj}')
    obj1 = SingleTonPattern('obj1')
    print(f'created object {obj1}')
    del obj1
    obj2 = SingleTonPattern('obj2')
    print(f'created object {obj2}')

if __name__=="__main__":
    main()