Re: Pass variable by reference

References	<mailman.9690.1399348396.18130.python-list@python.org> <53689aeb$0$11109$c3e8da3@news.astraweb.com> <87lhufi85o.fsf@elektro.pacujo.net> <mailman.9694.1399369998.18130.python-list@python.org> <87eh07i44p.fsf@elektro.pacujo.net>
Date	2014-05-06 20:45 +1000
Subject	Re: Pass variable by reference
From	Chris Angelico <rosuav@gmail.com>
Newsgroups	comp.lang.python
Message-ID	<mailman.9696.1399373123.18130.python-list@python.org> (permalink)

Show all headers | View raw

On Tue, May 6, 2014 at 8:38 PM, Marko Rauhamaa <marko@pacujo.net> wrote:
> Chris Angelico <rosuav@gmail.com>:
>
>>>     characters, words, lines = stats.read()
>>
>> That's not really pass-by-reference, though. What you're doing is
>> output parameters, which are usually implemented in C with pointers,
>> but in Python with a return tuple.
>
> Correct, but it is worth questioning the question itself: what do you
> need pass-by-reference for? A very common case is returning multiple
> values. For that, Python has other idioms available.

Oh, absolutely. As in many other cases, you shouldn't ask "How do I do
<some non-Python idiom> in Python", but should ask "How do I
accomplish <some goal> in Python". Only in a few cases is the first
question reasonable (eg "How do I call this function from Python",
naming some function from a C library), and even then, it's
semantically arguable.

ChrisA

Back to comp.lang.python | Previous | Next — Previous in thread | Find similar | Unroll thread

Thread

Pass variable by reference Satish Muthali <satish.muthali@gmail.com> - 2014-05-05 17:39 -0700
  Re: Pass variable by reference Rustom Mody <rustompmody@gmail.com> - 2014-05-05 21:32 -0700
  Re: Pass variable by reference Steven D'Aprano <steve@pearwood.info> - 2014-05-06 08:18 +0000
    Re: Pass variable by reference Marko Rauhamaa <marko@pacujo.net> - 2014-05-06 12:11 +0300
      Re: Pass variable by reference Chris Angelico <rosuav@gmail.com> - 2014-05-06 19:53 +1000
        Re: Pass variable by reference Marko Rauhamaa <marko@pacujo.net> - 2014-05-06 13:38 +0300
          Re: Pass variable by reference Chris Angelico <rosuav@gmail.com> - 2014-05-06 20:45 +1000

csiph-web