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#coding:utf-8

'''

filename: singleton.py

'''

class Singleton:

_instance = None

def __new__(cls, *args, **kwargs):

if not cls._instance:

cls._instance = super().__new__(cls)

return cls._instance

class MyClass(Singleton):

a = 1

x = MyClass()

y = MyClass()

print(x)

print(y)

print("x is y: ", x is y)