GNU bug report logs -
#32876
26.1; python-mode mixes existing tabs with new spaces
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Reported by: starback <at> stp.lingfil.uu.se (Per Starbäck)
Date: Sat, 29 Sep 2018 16:14:01 UTC
Severity: normal
Tags: confirmed, wontfix
Found in version 26.1
Done: Lars Ingebrigtsen <larsi <at> gnus.org>
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bug#32876
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(Sat, 29 Sep 2018 16:14:02 GMT)
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starback <at> stp.lingfil.uu.se (Per Starbäck)
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(Sat, 29 Sep 2018 16:14:02 GMT)
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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):
In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.26)
### Problem ###
I did "emacs -Q pytab.py" where pytab.py contains the two lines:
------------------------------
def foo():
print('hello')
------------------------------
The second line begins with a TAB.
Then I add a line to this marvellous program with
M-> TAB print('world') C-x C-s
This new line will have eight spaces in the beginning, and because of
that this is no longer a valid Python3 program!
### Background ###
Earlier you could mix spaces and tabs (seen as 8 spaces) in Python, but
Python3 disallows mixing them.
Spaces are preferred, and the style guide "PEP 8" says that
Tabs should be used solely to remain consistent with code that is
already indented with tabs.
So python-mode ought to help you remain consistent with such old
code. I think that checking with what characters the current block is
indented all the time would be overdoing it for something that shouldn't
occur that often, but that it should suffice to just scan through the
visited file to see if it contains any tabs in that case instead turn on
indent-tabs-mode instead of turning it off.
Information forwarded
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bug-gnu-emacs <at> gnu.org
:
bug#32876
; Package
emacs
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(Sat, 29 Sep 2018 20:07:02 GMT)
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Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):
On 29.09.2018 18:13, Per Starbäck wrote:
> In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.26)
>
> ### Problem ###
>
> I did "emacs -Q pytab.py" where pytab.py contains the two lines:
>
> ------------------------------
> def foo():
> print('hello')
> ------------------------------
>
> The second line begins with a TAB.
>
> Then I add a line to this marvellous program with
>
> M-> TAB print('world') C-x C-s
>
> This new line will have eight spaces in the beginning, and because of
> that this is no longer a valid Python3 program!
>
> ### Background ###
>
> Earlier you could mix spaces and tabs (seen as 8 spaces) in Python, but
> Python3 disallows mixing them.
>
> Spaces are preferred, and the style guide "PEP 8" says that
>
> Tabs should be used solely to remain consistent with code that is
> already indented with tabs.
>
> So python-mode ought to help you remain consistent with such old
> code. I think that checking with what characters the current block is
> indented all the time would be overdoing it for something that shouldn't
> occur that often, but that it should suffice to just scan through the
> visited file to see if it contains any tabs in that case instead turn on
> indent-tabs-mode instead of turning it off.
>
>
>
May confirm that with
GNU Emacs 27.0.50 (build 1, i686-pc-linux-gnu, GTK+ Version 3.14.5) of
2018-09-19
python.el hard-codes
(set (make-local-variable 'indent-tabs-mode) nil)
which should be customizable.
Added tag(s) confirmed.
Request was from
Noam Postavsky <npostavs <at> gmail.com>
to
control <at> debbugs.gnu.org
.
(Thu, 25 Oct 2018 00:52:02 GMT)
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Information forwarded
to
bug-gnu-emacs <at> gnu.org
:
bug#32876
; Package
emacs
.
(Wed, 23 Jun 2021 14:39:02 GMT)
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Message #13 received at 32876 <at> debbugs.gnu.org (full text, mbox):
starback <at> stp.lingfil.uu.se (Per Starbäck) writes:
> I did "emacs -Q pytab.py" where pytab.py contains the two lines:
>
> ------------------------------
> def foo():
> print('hello')
> ------------------------------
>
> The second line begins with a TAB.
>
> Then I add a line to this marvellous program with
>
> M-> TAB print('world') C-x C-s
>
> This new line will have eight spaces in the beginning, and because of
> that this is no longer a valid Python3 program!
>
> ### Background ###
>
> Earlier you could mix spaces and tabs (seen as 8 spaces) in Python, but
> Python3 disallows mixing them.
Andreas Röhler <andreas.roehler <at> easy-emacs.de> writes:
> python.el hard-codes
>
> (set (make-local-variable 'indent-tabs-mode) nil)
>
> which should be customizable.
Well, I don't know -- the problem is that mixing them leads to invalid
programs, so specifying a single tab mode here makes sense, since it
will presumably lead to fewer problems in the long run.
That is, python-mode doesn't really support .py files with tabs in
them -- as a design decision. So I think this works as designed.
Anybody else have an opinion here?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
Information forwarded
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bug-gnu-emacs <at> gnu.org
:
bug#32876
; Package
emacs
.
(Sat, 07 May 2022 12:01:02 GMT)
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Message #16 received at 32876 <at> debbugs.gnu.org (full text, mbox):
Lars Ingebrigtsen <larsi <at> gnus.org> writes:
> Well, I don't know -- the problem is that mixing them leads to invalid
> programs, so specifying a single tab mode here makes sense, since it
> will presumably lead to fewer problems in the long run.
>
> That is, python-mode doesn't really support .py files with tabs in
> them -- as a design decision. So I think this works as designed.
>
> Anybody else have an opinion here?
Nobody had in half a year, so I'm closing this bug report.
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no
Added tag(s) wontfix.
Request was from
Lars Ingebrigtsen <larsi <at> gnus.org>
to
control <at> debbugs.gnu.org
.
(Sat, 07 May 2022 12:01:03 GMT)
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bug closed, send any further explanations to
32876 <at> debbugs.gnu.org and starback <at> stp.lingfil.uu.se (Per Starbäck)
Request was from
Lars Ingebrigtsen <larsi <at> gnus.org>
to
control <at> debbugs.gnu.org
.
(Sat, 07 May 2022 12:01:03 GMT)
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bug archived.
Request was from
Debbugs Internal Request <help-debbugs <at> gnu.org>
to
internal_control <at> debbugs.gnu.org
.
(Sun, 05 Jun 2022 11:24:07 GMT)
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This bug report was last modified 1 year and 324 days ago.
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