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Simple example of meta-class (See related posts)

Use metaclass to define the representation
of a class (not an instance).
>>> class Pretty(type):
...     def __str__(cls):
...         return '<Class ' + cls.__name__ +'>'
...     
>>> class Foo(object):
...     __metaclass__ = Pretty
...     
>>> str(Foo)
'<Class Foo>'
>>>

Representation of an instance can be done using class.
Representation of a class can be done using meta-class.
The code is adapted from this blog post.
to python metaclass by korakot on Wed Oct 05 21:07:45 -0400 2005

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