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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: RE Module Performance
Date: Sat, 27 Jul 2013 12:13:39 -0400
Organization: IISS Elusive Unicorn
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On 27 Jul 2013 03:37:20 GMT, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> declaimed the following:


>I disagree, and so does Jeremy Sanders who first pointed out the 
>similarity between Emacs' UTF-8 and Python's FSR. I'll quote from the 
>Emacs documentation again:
>
>"To conserve memory, Emacs does not hold fixed-length 22-bit numbers that
>are codepoints of text characters within buffers and strings. Rather,
>Emacs uses a variable-length internal representation of characters, that
>stores each character as a sequence of 1 to 5 8-bit bytes, depending on
>the magnitude of its codepoint. For example, any ASCII character takes
>up only 1 byte, a Latin-1 character takes up 2 bytes, etc."
>
>And the Python FSR:
>
>"To conserve memory, Python does not hold fixed-length 21-bit numbers that
>are codepoints of text characters within buffers and strings. Rather,
>Python uses a variable-length internal representation of characters, that
>stores each character as a sequence of 1 to 4 8-bit bytes, depending on
>the magnitude of the largest codepoint in the string. For example, any 
>all-ASCII or all-Latin1 string takes up only 1 byte per character, an all-
>BMP string takes up 2 bytes per character, etc."
>

	As I read those: Python states "any all-ASCII or all-Latin1 string
takes up only 1 byte per character", etc. IE; the entire STRING is based
upon the minimal size that can encode all characters in the string.

	The EMACS statement doesn't specify a "string", it implies, in "any
ASCII character takes up only 1 byte, a Latin-1 character takes up 2 bytes,
etc.", that a string can contain mixed length characters.

-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/