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Groups > comp.lang.python > #67353

Re: Can tuples be replaced with lists all the time?

From Roy Smith <roy@panix.com>
Newsgroups comp.lang.python
Subject Re: Can tuples be replaced with lists all the time?
Date 2014-02-23 12:48 -0500
Organization PANIX Public Access Internet and UNIX, NYC
Message-ID <roy-099864.12485223022014@news.panix.com> (permalink)
References <64af70e3-6876-4fbf-8386-330d2f48735a@googlegroups.com> <led9s7$req$1@reader1.panix.com>

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In article <led9s7$req$1@reader1.panix.com>,
 Grant Edwards <invalid@invalid.invalid> wrote:

> In constrast, tuples are often used as fixed-length heterogenous
> containers (more like a struct in C except the fields are named 0, 1,
> 2, 3, etc.).  In a particular context, the Nth element of a tuple will
> always mean one thing (e.g. a person's last name) while the Mth
> element will always be something else (e.g. a person's age).

And, of course, namedtuples make that much more explicit.

It also appears that tuples are more memory efficient.  I just ran some 
quick tests on my OSX box.  Creating a list of 10 million [1, 2, 3, 4, 
5] lists gave me a 1445 MB process.   The name number of (1, 2, 3, 4, 5) 
tuples was 748 MB.  I'm sure this is implementation dependent, but it 
seems plausible to assume similar results will be had on other 
implementations.

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Thread

Can tuples be replaced with lists all the time? Sam <lightaiyee@gmail.com> - 2014-02-22 20:06 -0800
  Re: Can tuples be replaced with lists all the time? Paul Rubin <no.email@nospam.invalid> - 2014-02-22 20:28 -0800
  Re: Can tuples be replaced with lists all the time? Chris Angelico <rosuav@gmail.com> - 2014-02-23 15:18 +1100
  Re: Can tuples be replaced with lists all the time? Ben Finney <ben+python@benfinney.id.au> - 2014-02-23 15:49 +1100
  Re: Can tuples be replaced with lists all the time? 88888 Dihedral <dihedral88888@gmail.com> - 2014-02-23 11:45 -0800
  Re: Can tuples be replaced with lists all the time? Roy Smith <roy@panix.com> - 2014-02-22 23:19 -0500
    Re: Can tuples be replaced with lists all the time? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-03-02 17:21 -0500
  Re: Can tuples be replaced with lists all the time? Grant Edwards <invalid@invalid.invalid> - 2014-02-23 17:07 +0000
    Re: Can tuples be replaced with lists all the time? Roy Smith <roy@panix.com> - 2014-02-23 12:48 -0500
      Re: Can tuples be replaced with lists all the time? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-03-01 21:20 +0000
      Re: Can tuples be replaced with lists all the time? Terry Reedy <tjreedy@udel.edu> - 2014-03-01 18:15 -0500

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