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class MyMeta(type):
...     def __init__(cls,name,bases,dic):
...         print cls.__name__
...         print name
...     def __str__(cls):return 'Beautiful class %s'%cls.__name__
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class MyClass(object):
...     __metaclass__ = MyMeta
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MyClass
MyClass
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print MyClass
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Beautiful class MyClass
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class Singleton(type):
...     def __init__(cls,name,bases,dic):
...         super(Singleton,cls).__init__(name,bases,dic)
...         cls.instance = None
...     def __call__(cls,*args,**kwargs):
...         if cls.instance is None:
...             cls.instance = super(Singleton,cls).__call__(*args,**kwargs)
...         return cls.instance
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