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To: python-list@python.org
From: Peter Otten <__peter__@web.de>
Subject: Re: exec
Date: Fri, 02 Mar 2012 08:26:13 +0100
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Xref: csiph.com comp.lang.python:21128

Prasad, Ramit wrote:

> Hi Peter,
> 
> >>> class Magnitude(object):
> 
> ...     def __init__(self, value):
> ...             self.value = value
> ...     def __call__(self, uf=1):
> ...             if uf == 1:
> ...                     return self
> ...             return self.value
> ...
> 
> >>> class Iron(object):
> 
> ...     def __init__(self):
> ...             self.rho = Magnitude(42)
> ...
> 
> 
> Why did you make uf=1 instead of None?
> 
> ...     def __call__(self, uf=None):
> ...             if uf is None:

That's a design decision of the OP. I suggested an improvement of the 
implementation and left the interface alone.