Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Newsgroups: comp.lang.python
Subject: Re: Late-binding of function defaults (was Re: What is a function parameter =[] for?)
Date: Wed, 25 Nov 2015 13:32:46 -0500
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On Wed, 25 Nov 2015 14:34:12 +0000, BartC <bc@freeuk.com> declaimed the
following:

>On 25/11/2015 13:53, Marko Rauhamaa wrote:
>Now try explaining again to me how you would use tuples for the same 
>thing...

	You wouldn't -- you would decompose the tuple and create a new one from
the parts, with changes as needed.

	And as hinted, tuples were immutable in Python so they could be used as
keys in dictionaries.  The associated concept then also makes sense --
lists commonly holding multiple independent entities of the same type vs an
ordered collection of dependent entities of different types.

	And tuple, as used by Python, is a close match to tuple as used by
relational theory -- everything in the tuple is related in some way. If one
is to make a change to a component of a relational tuple, it is no longer
the same tuple.
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/