class Singleton(object):
_instance = None
def __new__(cls, *args, **kwargs):
if not cls._instance:
cls._instance = super(Singleton, cls).__new__(cls, *args, **kwargs)
return cls._instance
if __name__ == '__main__':
s1=Singleton()
s2=Singleton()
if(id(s1)==id(s2)):
print "Same"
else:
print "Different"
输出结果： same
>>> help(id)
Help on built-in function id in module __builtin__:
id(...)
id(object) -> integer
Return the identity of an object. This is guaranteed to be unique among
simultaneously existing objects. (Hint: it's the object's memory address.)
说明，两个实例指向了同一个内存地址，为同一个对象。