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To: python-list@python.org
From: Neil Cerutti <neilc@norwich.edu>
Subject: Re: Closure/method definition question for Python 2.7
Date: Tue, 11 Mar 2014 13:20:35 +0000 (UTC)
Organization: Norwich University
References: <mailman.8014.1394472539.18130.python-list@python.org> <87vbvmq7l3.fsf@elektro.pacujo.net>
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Xref: csiph.com comp.lang.python:68216

On 2014-03-10, Marko Rauhamaa <marko@pacujo.net> wrote:
> "Brunick, Gerard:(Constellation)" <Gerard.Brunick@constellation.com>:
>
>> class Test(object):
>>     x = 10
>>
>>     def __init__(self):
>>         self.y = x
>>
>> t = Test()
>> ---
>>
>> raises
>>
>> NameError: global name 'x' is not defined.
>
> In the snippet, x is neither local to __init__() nor global to
> the module. It is in the class scope. You can refer to it in
> one of two ways:
>
>    Test.x
>
> or:
>
>    self.x

The latter will work only to read the class variable. If you
assign to self.x you'll create a new instance variable that hides
the class variable.

-- 
Neil Cerutti