def _in_render_value(self):
'''
This method is called when rendered was called recursively.
This means that we are enclosed by the field we depend on.
So consider carefully what value are you going to return....
:rtype: Bits
:return: a dummy rendered value
'''
raise NotImplementedError('_in_render_value should be implemented in subclass (%s)' % type(self).__name__)
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