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Re: open: 'ascii', 'backslashreplace' not behaving as expected - why?

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From Lawrence D’Oliveiro <ldo@nz.invalid>
Newsgroups comp.lang.python
Subject Re: open: 'ascii', 'backslashreplace' not behaving as expected - why?
Date Sat, 8 Aug 2026 01:19:32 -0000 (UTC)
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On Sat, 8 Aug 2026 00:38:24 -0000 (UTC), Veek M wrote:

> So in kate, i Ctrl-Shift-U and type ffff to enter a unicode
> codepoint of 0xffff. Then at the REPL prompt i do
> fh = open('/tmp/x', 'rt', -1, 'ascii', 'backslashreplace', None)
>
> and i get
> fh.readline()
> '\\xef\\xbf\\xbf\n'
>
> Since I wrote two bytes 0xff and 0xff into Kate - why am i getting
> 0xef 0xbf and 0xbf ?

    Python 3.14.6 (main, Jun 10 2026, 18:54:31) [GCC 15.2.0] on linux
    Type "help", "copyright", "credits" or "license" for more information.
    >>> b'\xef\xbf\xbf\n'.decode()
    '\uffff\n'

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open: 'ascii', 'backslashreplace' not behaving as expected - why? Veek M <veekjunk@foobar.com> - 2026-08-08 00:38 +0000
  Re: open: 'ascii', 'backslashreplace' not behaving as expected - why? Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-08-08 01:19 +0000
    Re: open: 'ascii', 'backslashreplace' not behaving as expected - why? Veek M <veekjunk@foobar.com> - 2026-08-08 04:22 +0000
      Re: open: 'ascii', 'backslashreplace' not behaving as expected - why? Veek M <veekjunk@foobar.com> - 2026-08-08 04:25 +0000
        Re: open: 'ascii', 'backslashreplace' not behaving as expected - why? Veek M <veekjunk@foobar.com> - 2026-08-08 04:33 +0000
          Re: open: 'ascii', 'backslashreplace' not behaving as expected - why? Greg Ewing <greg.ewing@canterbury.ac.nz> - 2026-08-10 12:08 +1200

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