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Date: Wed, 24 Oct 2012 23:39:38 +1100
Subject: Re: classes
From: Chris Angelico <rosuav@gmail.com>
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Xref: csiph.com comp.lang.python:32033

On Wed, Oct 24, 2012 at 11:11 PM, inshu chauhan <insideshoes@gmail.com> wrote:
> print " Adding twice of %4.2f gives " % (y.addtwice())
>
>
> Error is :
>
> Traceback (most recent call last):
>   File "Z:\learning Python\learn5.py", line 35, in <module>
>     print " Adding twice of %4.2f gives " % (y.addtwice())
> TypeError: addtwice() takes exactly 2 arguments (1 given)
>
> why the prog is having this error with self nd x as arguments ???

The first argument is 'self', which is being passed y, but you also
need to pass it a value to add twice. You're ignoring the argument to
__init__ so I don't know what your purpose is, but possibly you should
be saving that into self somewhere??

ChrisA