Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!news.szaf.org!feedme.news.telefonica.de!telefonica.de!diesel.cu.mi.it!.POSTED!not-for-mail
From: pecore@pascolo.net
Newsgroups: comp.lang.python
Subject: Re: Explanation of list reference
Date: Fri, 14 Feb 2014 23:34:04 +0100
Organization: The Sun and the Rain.
Lines: 27
Message-ID: <87iosh9vdv.fsf@pascolo.net>
References: <13208de8-0f85-4e60-b059-dc087c8fda41@googlegroups.com>
NNTP-Posting-Host: ppp-211-23.21-151.libero.it
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Trace: virtdiesel.mng.cu.mi.it 1392417245 30258 151.21.23.211 (14 Feb 2014 22:34:05 GMT)
X-Complaints-To: abuse@diesel.cu.mi.it
NNTP-Posting-Date: Fri, 14 Feb 2014 22:34:05 +0000 (UTC)
User-Agent: Gnus/5.1008 (Gnus v5.10.8) XEmacs/21.5-b34 (linux)
Cancel-Lock: sha1:fMqZ/gdN6yMkQxSxiuArlxxH6Rg=
Xref: csiph.com comp.lang.python:66336

dave em <daveandem2000@gmail.com> writes:

> He is asking a question I am having trouble answering which is how a
> variable containing a value differs from a variable containing a
> list or more specifically a list reference.

s/list/mutable object/

# Mr Bond and Mr Tont are two different ob^H^H persons
james_bond = SecretAgent()
james_tont = SecretAgent()

# in some circles, Mr Bond is know as agent 007
agent_007 = james_bond

# Mr Bond, aka 007, is sent to the Caribbeans to crush Spectre
agent_007.move_to('Barbados')
print agent_007.location
print james_bond.location

# Mr Bond, alas, retires and his place in the Mi5 is taken, alas, by Mr Tont
agent_007 = james_tont

# Mr Tont, aka 007, is sent to Hong Kong to, to, whatever... 
agent_007.move_to('Hong Kong')
print agent_007.location
print james_bond.location