Shows basic usage of Python Singleton

singleton.py

# singleton.py illustrates how to use singleton design pattern in python
# influenced by Trevor Pain https://www.youtube.com/watch?v=6IV_FYx6MQA
# Author: Aaron Phalen | Twitter: @aaron_phalen | Email: [email protected]

# In python, a singleton is a design patter which allows once instance of a class to be invoked
# or stored in memory.

class Singleton(object):
    _instance = None
    def __new__(self):
        if not self._instance:
            self._instance = super(Singleton, self).__new__(self)
        return self._instance
        
class Singleton(object):
    _instance = None
    def __new__(cls):
        if not cls._instance:
            cls._instance = cls.__new__(cls)
        return cls._instance
        
s1 = Singleton()
s2 = Singleton()
print s1 is s2

# Output: True