Groups > comp.lang.python > #197866

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

From	Veek M <veekjunk@foobar.com>
Newsgroups	comp.lang.python
Subject	open: 'ascii', 'backslashreplace' not behaving as expected - why?
Date	2026-08-08 00:38 +0000
Organization	A noiseless patient Spider
Message-ID	<1155tpv$13on7$1@dont-email.me> (permalink)

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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 ?

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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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