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To: python-list@python.org
From: Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject: Re: Can Python function return multiple data?
Date: Fri, 05 Jun 2015 02:40:48 +0100
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Xref: csiph.com comp.lang.python:92112

On 05/06/2015 01:16, BartC wrote:
> On 05/06/2015 00:13, Steven D'Aprano wrote:
>> On Fri, 5 Jun 2015 06:52 am, BartC wrote:
>>
>>> On 04/06/2015 18:11, Steven D'Aprano wrote:
>>>
>>>> If there is
>>>> any language where assignment uses one style and argument passing
>>>> always
>>>> uses another, I've never come across it.
>>>
>>> My language does that. I'd be very surprised if it was the only one in
>>> existence that does so.
>>
>> I would be. That means that
>>
>> func(x)
>>
>> and
>>
>> tmp = x
>> func(tmp)
>>
>> behave differently,
>
> Not as far as func() is concerned. But overall there is a difference
> because now tmp contains a copy of x. (Also, if x contains a list for
> example, func() can modify the copy in tmp, not in x. But this shouldn't
> be surprised because the code is different!)
>

Really?

 >>> x=[1,2,3]
 >>> tmp=x
 >>> def func(thing):
...     thing.clear()
...
 >>> func(tmp)
 >>> tmp
[]
 >>> x
[]

-- 
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.

Mark Lawrence