display/encoding issue from python-code

display/encoding issue from python-code

[Andreas Röhler]

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Hi,

got a display and encoding issue from some python-code:

day = [
     r'\d{2}',    #  "DD"
]

In a plain python-file all seems fine.

See attached align-day.py

But, check with the following snippet:

(defun my-test()
   (interactive)
   (set-buffer (get-buffer-create "my-test-buffer"))
   (switch-to-buffer (current-buffer))
   (python-mode)
   (insert "day = [
     r'\d{2}',    #  \"DD\"
]"))

In my-test-buffer instead of

r'\d

appears

r'^?

See attached my-test.png

Not only that it looks strange, ‘\d’ now seems to count as one character 
in buffer, so ‘string-match’ for example doesn't return the correct 
position any more.

Setting ‘buffer-file-coding-system’ to ‘utf-8-unix’ explicitly didn't help.

Any suggestion?

Thanks,
Andreas

GNU Emacs 31.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.33, 
cairo version 1.16.0) of 2024-08-12

[-- Attachment #2: align-day.py --]
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day = [
    r'\d{2}'    #  "DD" 
]

[-- Attachment #3: my-test.png --]
[-- Type: image/png, Size: 123187 bytes --]

Re: display/encoding issue from python-code

[Stephen Berman]

On Mon, 12 Aug 2024 14:45:06 +0200 Andreas Röhler <andreas.roehler@easy-emacs.de> wrote:

> Hi,
>
> got a display and encoding issue from some python-code:
>
> day = [
>     r'\d{2}',    #  "DD"
> ]
>
> In a plain python-file all seems fine.
>
> See attached align-day.py
>
> But, check with the following snippet:
>
> (defun my-test()
>   (interactive)
>   (set-buffer (get-buffer-create "my-test-buffer"))
>   (switch-to-buffer (current-buffer))
>   (python-mode)
>   (insert "day = [
>     r'\d{2}',    #  \"DD\"
> ]"))
>
> In my-test-buffer instead of
>
> r'\d
>
> appears
>
> r'^?
>
> See attached my-test.png
>
> Not only that it looks strange, ‘\d’ now seems to count as one character in
> buffer, so ‘string-match’ for example doesn't return the correct position any
> more.
>
> Setting ‘buffer-file-coding-system’ to ‘utf-8-unix’ explicitly didn't help.
>
> Any suggestion?

When using Lisp to insert a string containing a backslash, you have to
double the backslash:

(insert "day = [
    r'\\d{2}',    #  \"DD\"
]")

Steve Berman

Re: display/encoding issue from python-code

[Andreas Röhler]

Am 12.08.24 um 15:03 schrieb Stephen Berman:
> On Mon, 12 Aug 2024 14:45:06 +0200 Andreas Röhler <andreas.roehler@easy-emacs.de> wrote:
>
>> Hi,
>>
>> got a display and encoding issue from some python-code:
>>
>> day = [
>>      r'\d{2}',    #  "DD"
>> ]
>>
>> In a plain python-file all seems fine.
>>
>> See attached align-day.py
>>
>> But, check with the following snippet:
>>
>> (defun my-test()
>>    (interactive)
>>    (set-buffer (get-buffer-create "my-test-buffer"))
>>    (switch-to-buffer (current-buffer))
>>    (python-mode)
>>    (insert "day = [
>>      r'\d{2}',    #  \"DD\"
>> ]"))
>>
>> In my-test-buffer instead of
>>
>> r'\d
>>
>> appears
>>
>> r'^?
>>
>> See attached my-test.png
>>
>> Not only that it looks strange, ‘\d’ now seems to count as one character in
>> buffer, so ‘string-match’ for example doesn't return the correct position any
>> more.
>>
>> Setting ‘buffer-file-coding-system’ to ‘utf-8-unix’ explicitly didn't help.
>>
>> Any suggestion?
> When using Lisp to insert a string containing a backslash, you have to
> double the backslash:
>
> (insert "day = [
>      r'\\d{2}',    #  \"DD\"
> ]")
>
> Steve Berman


Oh yeah, thanks!