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Re: python-shell-send-region uses wrong encoding?

From: Stefan Monnier
Subject: Re: python-shell-send-region uses wrong encoding?
Date: Tue, 29 Oct 2013 13:28:38 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (gnu/linux)

> This is the same output that I get when I run the script in a terminal.
> However, if I select the lines after 'from __future__ ...' until the end and
> do python-shell-send-region (C-c C-r) I get this output instead:

> u'W\xf6rterbuch'
> u'W\xc3\xb6rterbuch'

> The second line of output seems to indicate that the text was sent in a
> different encoding compared to python-shell-send-buffer.

No, it indicates that Python interpreted the bytes sent by Emacs in
a different way: the first line (where you explicitly asked for a utf-8
decoding) indicates that the bytes indeed use the right utf-8 encoding,
but the second indicates that Python does not decode the input as utf-8
but as something else (presumably latin-1).

E.g. the patch below (which causes python-shell-send-string to tell
Python that the file sent is using utf-8) should fix your problem (tho
it's not a proper fix, since we shouldn't hardcode utf-8 here, but copy
which ever -*- coding: -*- coding is in the file).

Fabián, could you write a cleaner fix?


=== modified file 'lisp/progmodes/python.el'
--- lisp/progmodes/python.el    2013-10-07 18:51:26 +0000
+++ lisp/progmodes/python.el    2013-10-29 17:25:11 +0000
@@ -2047,6 +2047,7 @@
                (temp-file-name (make-temp-file "py"))
                (file-name (or (buffer-file-name) temp-file-name)))
           (with-temp-file temp-file-name
+            (insert "# -*- coding: utf-8 -*-")
             (insert string)
           (python-shell-send-file file-name process temp-file-name))

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