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From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Ada and Unicode
Date: Sat, 09 Apr 2022 12:46:04 -0400	[thread overview]
Message-ID: <pjd35hp8i1l7qflnltn7r9cp61u1uh8dv2@4ax.com> (raw)
In-Reply-To: 62515f7a$0$25324$426a74cc@news.free.fr

On Sat, 9 Apr 2022 12:27:04 +0200, DrPi <314@drpi.fr> declaimed the
following:

>
>In Python-3, a string is a character(glyph ?) array. The internal 
>representation is hidden to the programmer.

	<SNIP>
>
>On the Ada side, I've still not understood how to correctly deal with 
>all this stuff.

	One thing to take into account is that Python strings are immutable.
Changing the contents of a string requires constructing a new string from
parts that incorporate the change.

	That allows for the second aspect -- even if not visible to a
programmer, Python (3) strings are not a fixed representation: If all
characters in the string fit in the 8-bit UTF range, that string is stored
using one byte per character. If any character uses a 16-bit UTF
representation, the entire string is stored as 16-bit characters (and
similar for 32-bit UTF points). Thus, indexing into the string is still
fast -- just needing to scale the index by the character width of the
entire string.

	


-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
	wlfraed@ix.netcom.com    http://wlfraed.microdiversity.freeddns.org/

  reply	other threads:[~2022-04-09 16:46 UTC|newest]

Thread overview: 63+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-17 22:03 Ada and Unicode DrPi
2021-04-18  0:02 ` Luke A. Guest
2021-04-19  9:09   ` DrPi
2021-04-19  8:29 ` Maxim Reznik
2021-04-19  9:28   ` DrPi
2021-04-19 13:50     ` Maxim Reznik
2021-04-19 15:51       ` DrPi
2021-04-19 11:15   ` Simon Wright
2021-04-19 11:50     ` Luke A. Guest
2021-04-19 15:53     ` DrPi
2022-04-03 19:20     ` Thomas
2022-04-04  6:10       ` Vadim Godunko
2022-04-04 14:19         ` Simon Wright
2022-04-04 15:11           ` Simon Wright
2022-04-05  7:59           ` Vadim Godunko
2022-04-08  9:01             ` Simon Wright
2023-03-30 23:35         ` Thomas
2022-04-04 14:33       ` Simon Wright
2021-04-19  9:08 ` Stephen Leake
2021-04-19  9:34   ` Dmitry A. Kazakov
2021-04-19 11:56   ` Luke A. Guest
2021-04-19 12:13     ` Luke A. Guest
2021-04-19 15:48       ` DrPi
2021-04-19 12:52     ` Dmitry A. Kazakov
2021-04-19 13:00       ` Luke A. Guest
2021-04-19 13:10         ` Dmitry A. Kazakov
2021-04-19 13:15           ` Luke A. Guest
2021-04-19 13:31             ` Dmitry A. Kazakov
2022-04-03 17:24               ` Thomas
2021-04-19 13:24         ` J-P. Rosen
2021-04-20 19:13           ` Randy Brukardt
2022-04-03 18:04           ` Thomas
2022-04-06 18:57             ` J-P. Rosen
2022-04-07  1:30               ` Randy Brukardt
2022-04-08  8:56                 ` Simon Wright
2022-04-08  9:26                   ` Dmitry A. Kazakov
2022-04-08 19:19                     ` Simon Wright
2022-04-08 19:45                       ` Dmitry A. Kazakov
2022-04-09  4:05                         ` Randy Brukardt
2022-04-09  7:43                           ` Simon Wright
2022-04-09 10:27                           ` DrPi
2022-04-09 16:46                             ` Dennis Lee Bieber [this message]
2022-04-09 18:59                               ` DrPi
2022-04-10  5:58                             ` Vadim Godunko
2022-04-10 18:59                               ` DrPi
2022-04-12  6:13                               ` Randy Brukardt
2021-04-19 16:07         ` DrPi
2021-04-20 19:06         ` Randy Brukardt
2022-04-03 18:37           ` Thomas
2022-04-04 23:52             ` Randy Brukardt
2023-03-31  3:06               ` Thomas
2023-04-01 10:18                 ` Randy Brukardt
2021-04-19 16:14   ` DrPi
2021-04-19 17:12     ` Björn Lundin
2021-04-19 19:44       ` DrPi
2022-04-16  2:32   ` Thomas
2021-04-19 13:18 ` Vadim Godunko
2022-04-03 16:51   ` Thomas
2023-04-04  0:02     ` Thomas
2021-04-19 22:40 ` Shark8
2021-04-20 15:05   ` Simon Wright
2021-04-20 19:17     ` Randy Brukardt
2021-04-20 20:04       ` Simon Wright
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