GNU bug report logs - #44732
27.1; Inferior Python mode does not correctly display output of ipython3

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Brian Leung <leungbk <at> mailfence.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.1; Inferior Python mode does not correctly display output of
 ipython3
Date: Thu, 19 Nov 2020 02:04:36 +0100 (CET)

- emacs -q
- (setq python-shell-interpreter "ipython3")
- M-x run-python
- Enter 1 + 2 into the IPython prompt.

After hitting Enter, the '2' displays twice:

Python 3.8.6 (default, Sep 23 2020, 13:54:27) 
Type 'copyright', 'credits' or 'license' for more information
IPython 7.17.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: 1 + 2
1 + 22
Out[1]: 3

In [2]:


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Message #8 received at 44732 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Brian Leung <leungbk <at> mailfence.com>
Cc: 44732 <at> debbugs.gnu.org
Subject: Re: bug#44732: 27.1; Inferior Python mode does not correctly
 display output of ipython3
Date: Tue, 24 Nov 2020 08:55:49 +0100

Brian Leung <leungbk <at> mailfence.com> writes:

> In [1]: 1 + 2
> 1 + 22
> Out[1]: 3
>
> In [2]:

Not only that, it grows progressively weirder:

In [1]: 1 + 2
1 + 22
Out[1]: 3

In [2]: 1 + 3
11  ++  3333
Out[2]: 4

In [3]: 4 + 5
444   +++   555555
Out[3]: 9

In [4]: 1 + 2
1111    ++++    22222222
Out[4]: 3

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #13 received at 44732 <at> debbugs.gnu.org (full text, mbox):

From: Augusto Stoffel <arstoffel <at> gmail.com>
To: 44732 <at> debbugs.gnu.org
Subject: 27.1; Inferior Python mode does not correctly display output of
 ipython3
Date: Wed, 25 Aug 2021 20:30:57 +0200

This is solved by adding the following extra argument to ipython:

(setq python-shell-interpreter "ipython3"
      python-shell-interpreter-args "--simple-prompt")

Message #16 received at 44732 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Augusto Stoffel <arstoffel <at> gmail.com>
Cc: 44732 <at> debbugs.gnu.org
Subject: Re: bug#44732: 27.1; Inferior Python mode does not correctly
 display output of ipython3
Date: Thu, 26 Aug 2021 16:21:27 +0200

Augusto Stoffel <arstoffel <at> gmail.com> writes:

> This is solved by adding the following extra argument to ipython:
>
> (setq python-shell-interpreter "ipython3"
>       python-shell-interpreter-args "--simple-prompt")

Should the defaults in python.el be changed?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

Message #19 received at 44732 <at> debbugs.gnu.org (full text, mbox):

From: Augusto Stoffel <arstoffel <at> gmail.com>
To: Lars Ingebrigtsen <larsi <at> gnus.org>
Cc: 44732 <at> debbugs.gnu.org
Subject: Re: bug#44732: 27.1; Inferior Python mode does not correctly
 display output of ipython3
Date: Thu, 26 Aug 2021 17:02:54 +0200

On Thu, 26 Aug 2021 at 16:21, Lars Ingebrigtsen <larsi <at> gnus.org> wrote:

> Augusto Stoffel <arstoffel <at> gmail.com> writes:
>
>> This is solved by adding the following extra argument to ipython:
>>
>> (setq python-shell-interpreter "ipython3"
>>       python-shell-interpreter-args "--simple-prompt")
>
> Should the defaults in python.el be changed?

No, the defaults are good.  But there's a pitfall: if you change the
interpreter from "python" to the fancier "ipython", you need to add the
extra "--simple-prompt" argument.

Message #22 received at 44732 <at> debbugs.gnu.org (full text, mbox):

From: Lars Ingebrigtsen <larsi <at> gnus.org>
To: Augusto Stoffel <arstoffel <at> gmail.com>
Cc: 44732 <at> debbugs.gnu.org
Subject: Re: bug#44732: 27.1; Inferior Python mode does not correctly
 display output of ipython3
Date: Fri, 27 Aug 2021 04:51:13 +0200

Augusto Stoffel <arstoffel <at> gmail.com> writes:

> No, the defaults are good.  But there's a pitfall: if you change the
> interpreter from "python" to the fancier "ipython", you need to add the
> extra "--simple-prompt" argument.

Ah, I see.  I've now amended the doc string of
`python-shell-interpreter' to mention this.  And I think that should be
sufficient here, and I'm closing this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

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