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Simple Example Of Meta-class

Use metaclass to define the representation
of a class (not an instance).

>>> class Pretty(type):
...     def __str__(cls):
...         return ''
>>> class Foo(object):
...     __metaclass__ = Pretty
>>> str(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.

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