Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed3.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Date: Sun, 05 Jan 2014 12:09:52 -0800
From: Gary Herron <gary.herron@islandtraining.com>
User-Agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.2.0
MIME-Version: 1.0
To: python-list@python.org
Subject: Re: converting a string to a function parameter
References: <aaf29677-db0b-4749-84b1-ce965e0f545e@v5g2000prm.googlegroups.com> <ef4ee1e8-e247-4fda-ae5f-439dd9742a75@googlegroups.com>
In-Reply-To: <ef4ee1e8-e247-4fda-ae5f-439dd9742a75@googlegroups.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: quoted-printable
Precedence: list
Newsgroups: comp.lang.python
Message-ID: <mailman.4965.1388952599.18130.python-list@python.org>
Lines: 62
NNTP-Posting-Host: 2001:888:2000:d::a6
Xref: csiph.com comp.lang.python:63219

On 01/05/2014 11:39 AM, pietrodcof@gmail.com wrote:
> Il giorno venerd=EC 13 marzo 2009 08:52:39 UTC+1, koranthala ha scritto=
:
>> Hi,
>>      Is it possible to convert a string to a function parameter?
>> Ex:
>> str =3D 'True, type=3Drect, sizes=3D[3, 4]'
>> and I should be able to use it as:
>> test(convert(str)) and the behaviour should be same as calling test
>> with those values :
>> i.e. test(True, type=3Drect, sizes=3D[3, 4])
>>
>> I tried eval, but it did not work. And any other mechanism I think
>> turns out to be creating a full fledged python parser.
>>
>> Is there any mechanism with which we can do this straight away?
> I need the exact opposite, what is the inverse function?
> example: i pass to a function an argument
>
> m=3D[654,54,65]
> def function(m):
>      return takethenameof(m)
>
> and it have to return to me 'm' not [654,54,65] or '[654,54,65]'
>
> anybody can help?
> i think that when one is talking about a function he have to talk also =
of the inverse function (also because google have problems searching abou=
t this...

Absolutely not.  Objects (like [654,54,65]) do not have names, never did =

and never will!  Objects do have a type and a value (and an identity),=20
but not a name.

Various namespaces will have dictionary-like associations between a name =

(like "m") and an object, and it *is* possible to get your hands on a=20
(dictionary representing a) namespace and search it, but this is=20
troublesome.

For instance, consider this small variation of your code:

def function(m):
    return takethenameof(m)

a=3D[654,54,65]
b =3D a
function(a)

While function is running, there will be three names associated with the =
list object.
The outer namespace will have "a" and "b" associated with the list object=
,
and the namespace local to function will have "m" associated with the sam=
e object.
That's one object associated with three names in two different namespaces=
=2E

Gary Herron