GNU bug report logs - #11868
24.1.50; [python-mode] Blocking call to accept-process-output with quit inhibited!! (message buffer)

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

From: Yagnesh Raghava Yakkala <hi <at> yagnesh.org>
To: bug-gnu-emacs <at> gnu.org
Subject: 24.1.50;
	[python-mode] Blocking call to accept-process-output with quit
	inhibited!! (message buffer)
Date: Wed, 04 Jul 2012 02:12:12 +0900

I see this message when ever I try to use completion feature in python-mode.

there is another thread on the same topic in emacs-devel long ago but when
using gnus.
http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg00199.html

I couldn't understand what was discussed in that thread.

Anyway..

Steps reproduce this behavior:
1) emacs -q
2) C-x C-f test.py
3) C-c C-c  # start a inferior process
4) type some thing and hit M-tab



In GNU Emacs 24.1.50.4 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.10)
 of 2012-07-03 on ubu-vm
Windowing system distributor `The X.Org Foundation', version 11.0.11103000
Configured using:
 `configure '--prefix=/home/yagnesh/local/emacs-git' '--with-gnutls=yes'
 '--without-compress-info''

Important settings:
  value of $LC_COLLATE: en_US.UTF-8
  value of $LC_CTYPE: en_US.UTF-8
  value of $LC_MESSAGES: en_US.UTF-8
  value of $LANG: C
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Python/ein:notebook

Minor modes in effect:
  diff-auto-refine-mode: t
  semantic-minor-modes-format: ((:eval (if (or semantic-highlight-edits-mode semantic-show-unmatched-syntax-mode)  S)))
  nxhtml-menu-mode: t
  flyspell-mode: t
  display-battery-mode: t
  shell-dirtrack-mode: t
  recentf-mode: t
  yas/global-mode: t
  yas/minor-mode: t
  global-auto-complete-mode: t
  auto-complete-mode: t
  autopair-mode: t
  autopair-global-mode: t
  ido-everywhere: t
  display-time-mode: t
  show-paren-mode: t
  global-ede-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<backspace> <return> <return> C-p <backspace> <return> 
<backspace> i m <backspace> <backspace> <return> <backspace> 
i m p C-c C-f M-/ <backspace> <backspace> <backspace> 
<backspace> C-x C-s <tab> C-/ <backspace> <tab> <tab> 
<tab> <tab> C-/ C-/ C-a C-k C-x C-s C-h k C-g M-t M-k 
<f9> s ( d e <tab> <backspace> <backspace> s c <tab> 
SPC <tab> \ <backspace> " \ M - T a b <backspace> <backspace> 
<backspace> T A B C-M-x M-b < M-f > C-M-x C-b C-b C-b 
C-b C-b C-b C-b C-b C-k <backspace> ( k b d SPC " M 
- < t a b > C-M-x C-n <return> C-h k <tab> M-t M-k 
M-t C-p C-b C-b C-b C-n C-b C-b C-b C-b C-b C-b C-b 
C-b C-b <backspace> C-M-x SPC <backspace> C-n C-n <f3> 
<tab> <f4> M-x e d i <return> M-k M-b M-u C-b C-b C-b 
C-b - C-M-x S-TAB t a b C-k C-M-x M-t C-n C-b C-b C-b 
M-b M-b M-b M-b M-f C-f C-k C-n <return> C-y C-x C-e 
q C-n C-n M-b M-b \ C-M-x C-e C-x C-e q M-b < M-f > 
C-e C-x C-e C-p C-n <f3> M-i M-TAB C-h M-t M-t M-k 
M-TAB C-p i m p M-TAB SPC o s M-TAB . M-TAB M-TAB C-h 
k M-TAB M-t M-k M-t <tab> <tab> C-/ C-/ M-TAB C-h C-k 
M-TAB M-t M-t M-k M-t M-TAB C-h e C-p C-p C-p C-p C-p 
C-h C-a C-a C-n C-SPC C-n C-n C-p C-n C-b C-b C-b C-b 
C-b C-b C-b C-b C-b C-b C-b M-w M-t M-k M-t M-t M-t 
M-t M-k M-t M-k M-k M-t M-k M-t M-x e m a c s - b u 
g SPC <return> C-y M-y C-/ C-/ M-t C-x b C-x b m e 
s <return> C-/ M-k M-t M-t M-x <return>

Recent messages:

Load-path shadows:
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/home/yagnesh/.emacs.d/el-get/org-mode/lisp/org-compat hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/org-compat
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/ob-plantuml hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/ob-plantuml
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/org-habit hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/org-habit
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/ob-java hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/ob-java
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/org-ascii hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/org-ascii
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/org-datetree hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/org-datetree
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/org-faces hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/org-faces
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/org-mac-message hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/org-mac-message
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/org-colview hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/org-colview
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/org-plot hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/org-plot
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/ob-screen hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/ob-screen
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/ob-sql hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/ob-sql
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/ob-python hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/ob-python
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/ob-awk hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/ob-awk
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/org-footnote hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/org-footnote
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/org-exp-blocks hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/org-exp-blocks
/home/yagnesh/.emacs.d/el-get/org-mode/lisp/ob-fortran hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/org/ob-fortran
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/home/yagnesh/.emacs.d/el-get/org-mode/.dir-locals hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/gnus/.dir-locals
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Features:
(shadow emacsbug hl-line hippie-exp semantic/wisent/python semantic/dep
semantic/find semantic/wisent/python-wy semantic/wisent semantic/wisent/wisent
ein-mumamo mumamo-cmirr mumamo ein-connect ein-notebooklist ein-subpackages
ein-notebook ein-traceback ein-pytools ein-shared-output ein-kill-ring
ein-notification ein-pager ein-completer ein-cell ein-kernel ein-query
ein-events ein-websocket websocket calc calc-loaddefs calc-macs bindat
ein-node ein-log ewoc ein-utils json magit-bisect magit-key-mode magit
diff-mode log-edit pcvs-util add-log tabify url-queue ja-dic mule-util
japan-util kkc ja-dic-utl quail doc-view image-mode jka-compr bbdb-message
org-indent org-wl org-w3m org-vm org-rmail org-mhe org-mew org-irc org-jsinfo
org-infojs org-info org-gnus org-docview org-bibtex bibtex org-bbdb
org-inlinetask org-export org-element org-special-blocks org-html org-table
dired-x grep ede/dired ein rnc-mode ibuf-ext ibuffer cedet-edebug debug
smartrep flymake-files flymakemsg nxhtml-autostart nxhtml-autoload majmodpri
nxhtml-menu web-autoload nxhtml-base goto-addr autoinsert executable shr-color
color qp shr sort smiley flow-fill mm-archive gnus-async gnus-bcklg gnus-ml
disp-table gnus-topic nndoc nndraft nnmh nnml utf-7 nnfolder bbdb-gnus
bbdb-mua epa-file epa epg gnutls network-stream gnus-agent gnus-srvr
gnus-score score-mode nnvirtual gnus-cache spam spam-stat bbdb-com gnus-uu
yenc gnus-msg gnus-demon nntp gnus-cite nnir gnus-gravatar mail-extr gnus-art
mm-uu mml2015 epg-config mm-view mml-smime smime dig gnus-sum gnus-group
gnus-undo gravatar starttls nnimap nnmail mail-source parse-time utf7 netrc
nnoo gnus-start gnus-spec gnus-int gnus-range message rfc822 mailabbrev
gmm-utils mailheader gnus-win flyspell ispell eldoc tango-theme mediawiki
url-cache mm-url gnus gnus-ems nnheader mml mml-sec mm-decode mm-bodies
mm-encode url-http tls url url-proxy url-privacy url-expand url-methods
url-history mailcap url-auth mail-parse rfc2231 url-cookie url-domsuf url-util
url-parse url-gw url-vars edit-server smtpmail sendmail rfc2047 rfc2045
ietf-drums mail-utils ps-print ps-def lpr battery w3m-load webjump browse-url
flymake compile info-look sb-info info org-e-latex org-latex org-export-latex
org-beamer org-exp ob-exp org-exp-blocks org-agenda footnote diary-lib
diary-loaddefs org ob-emacs-lisp ob-tangle ob-ref ob-lob ob-table org-footnote
org-src ob-comint ob-keys ob ob-eval org-pcomplete org-list org-faces
org-compat org-entities org-macs noutline outline cal-menu calendar
cal-loaddefs org-install inf-ncl ncl-doc ncl cus-edit cus-start cus-load
tex-buf tex preview-latex tex-site auto-loads pylookup python rx xscheme
scheme highlight-parentheses hl-sexp thingatpt paredit windmove winner
tramp-cache tramp-sh tramp tramp-compat auth-source gnus-util mm-util
mail-prsvr password-cache shell pcomplete comint ansi-color ring format-spec
tramp-loaddefs recentf tree-widget uniquify imenu dictem yasnippet
dropdown-list derived easy-mmode auto-complete-config auto-complete fuzzy
popup autopair diminish smex ido time paren edmacro kmacro vc-git ede/cpp-root
ede/emacs cedet-devel-load warnings eieio-opt find-func advice advice-preload
srecode/map srecode semantic/canned-configs semantic/ia-sb semantic/analyze
semantic/sort semantic/scope semantic/analyze/fcn semantic/db semantic/ctxt
semantic/format semantic/tag-ls semantic/util-modes semantic/util semantic
semantic/tag semantic/lex semantic/fw mode-local cedet-compat inversion
ede/speedbar ede/files ede ede/base ede/auto ede/source eieio-base
eieio-speedbar speedbar pulse sb-image ezimage dframe assoc eieio-custom
wid-edit cedet eieio byte-opt cedet-remove-builtin .loaddefs bbdb timezone
bbdb-loaddefs el-get el-get-autoloads el-get-list-packages el-get-notify
help-mode easymenu view el-get-dependencies el-get-build el-get-status pp
el-get-recipes el-get-byte-compile el-get-methods el-get-fossil el-get-svn
el-get-pacman el-get-github-zip el-get-github-tar el-get-http-zip
el-get-http-tar el-get-hg el-get-git-svn el-get-fink el-get-emacswiki
el-get-http el-get-emacsmirror el-get-github el-get-git el-get-elpa package
cl-macs gv el-get-darcs el-get-cvs el-get-bzr el-get-brew el-get-builtin
el-get-apt-get el-get-custom el-get-core autoload help-fns bytecomp
byte-compile cconv dired cl cl-lib macroexp time-date tooltip ediff-hook
vc-hooks lisp-float-type mwheel x-win x-dnd tool-bar dnd fontset image
regexp-opt fringe tabulated-list newcomment lisp-mode register page menu-bar
rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax facemenu
font-core frame cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese case-table epa-hook jka-cmpr-hook help simple
abbrev minibuffer loaddefs button faces cus-face files text-properties overlay
sha1 md5 base64 format env code-pages mule custom widget
hashtable-print-readable backquote make-network-process dbusbind
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty emacs)

Message #8 received at 11868 <at> debbugs.gnu.org (full text, mbox):

From: Glenn Morris <rgm <at> gnu.org>
To: Yagnesh Raghava Yakkala <hi <at> yagnesh.org>
Cc: 11868 <at> debbugs.gnu.org
Subject: Re: bug#11868: 24.1.50;
	[python-mode] Blocking call to accept-process-output with quit
	inhibited!! (message buffer)
Date: Fri, 06 Jul 2012 13:39:00 -0400

Yagnesh Raghava Yakkala wrote:

> I see this message when ever I try to use completion feature in python-mode.

Which mode for python? The one that comes with Emacs?
("python-mode.el" does not.)

> http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg00199.html
>
> I couldn't understand what was discussed in that thread.

http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg00201.html

seems fairly clear. python mode should consider adding a with-local-quit
somewhere in its completion code.

Also:
http://lists.gnu.org/archive/html/emacs-devel/2012-04/msg00596.html

> Steps reproduce this behavior:
> 1) emacs -q
> 2) C-x C-f test.py
> 3) C-c C-c  # start a inferior process
> 4) type some thing and hit M-tab

This just prints "no match" for me.

> In GNU Emacs 24.1.50.4 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.10)
>  of 2012-07-03 on ubu-vm
[...]
> Major mode: Python/ein:notebook
[...]
> /home/yagnesh/.emacs.d/el-get/python/python hides /home/yagnesh/local/emacs-git/share/emacs/24.1.50/lisp/progmodes/python

Message #11 received at 11868 <at> debbugs.gnu.org (full text, mbox):

From: Yagnesh Raghava Yakkala <hi <at> yagnesh.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 11868 <at> debbugs.gnu.org
Subject: Re: bug#11868: 24.1.50;
	[python-mode] Blocking call to accept-process-output with quit
	inhibited!! (message buffer)
Date: Wed, 11 Jul 2012 02:08:09 +0900

Hello Glenn,

Glenn Morris <rgm <at> gnu.org> writes:

> Yagnesh Raghava Yakkala wrote:
>
>> I see this message when ever I try to use completion feature in python-mode.
>
> Which mode for python? The one that comes with Emacs?
> ("python-mode.el" does not.)

I meant "python.el" shipped with emacs trunk. sorry for not being clear.

>
>> http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg00199.html
>>
>> I couldn't understand what was discussed in that thread.
>
> http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg00201.html
>
> seems fairly clear. python mode should consider adding a with-local-quit
> somewhere in its completion code.

I could suppress the warning by wrapping function "with-local-quit". But It
seems python completion function is interacting with inferior process through
the comint mode, does it mean problem is in comint.? 

>> Steps reproduce this behavior:
>> 1) emacs -q
>> 2) C-x C-f test.py
>> 3) C-c C-c  # start a inferior process
>> 4) type some thing and hit M-tab
>
> This just prints "no match" for me.

above in step 4 pressing M-tab where there can be matchable list,

could you try for example some thing like this, (make sure first line
passes to the python process with C-c C-c)

--8<---------------cut here---------------start------------->8---
import os
os.<M-tab here>
--8<---------------cut here---------------end--------------->8---


Thanks.,
-- 
ఎందరో మహానుభావులు అందరికి వందనములు
YYR

Message #14 received at 11868 <at> debbugs.gnu.org (full text, mbox):

From: Yagnesh Raghava Yakkala <hi <at> yagnesh.org>
To: Glenn Morris <rgm <at> gnu.org>
Cc: 11868 <at> debbugs.gnu.org
Subject: Re: bug#11868: 24.1.50;
	[python-mode] Blocking call to accept-process-output with quit
	inhibited!! (message buffer)
Date: Wed, 11 Jul 2012 03:18:39 +0900

[Message part 1 (text/plain, inline)]

Hello Glenn,

Yagnesh Raghava Yakkala <hi <at> yagnesh.org> writes:

> Hello Glenn,
>
> Glenn Morris <rgm <at> gnu.org> writes:
>
>> Yagnesh Raghava Yakkala wrote:
>>
>>> I see this message when ever I try to use completion feature in python-mode.
>>
>> Which mode for python? The one that comes with Emacs?
>> ("python-mode.el" does not.)
>
> I meant "python.el" shipped with emacs trunk. sorry for not being clear.
>
>>
>>> http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg00199.html
>>>
>>> I couldn't understand what was discussed in that thread.
>>
>> http://lists.gnu.org/archive/html/emacs-devel/2010-09/msg00201.html
>>
>> seems fairly clear. python mode should consider adding a with-local-quit
>> somewhere in its completion code.
>
> I could suppress the warning by wrapping function "with-local-quit". But It
> seems python completion function is interacting with inferior process through
> the comint mode, does it mean problem is in comint.? 

may be not,

with some trail and error, the following patch is suppressing the warning.

[python.el.diff (text/x-diff, inline)]

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index ddedbdb..d6bb724 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -1609,7 +1609,8 @@ the output."
                       (setq output-buffer (concat output-buffer string))
                       "")))))
     (python-shell-send-string string process msg)
-    (accept-process-output process)
+    (with-local-quit
+      (accept-process-output process))
     (replace-regexp-in-string
      (if (> (length python-shell-prompt-output-regexp) 0)
          (format "\n*%s$\\|^%s\\|\n$"

[Message part 3 (text/plain, inline)]

Thanks.,
-- 
ఎందరో మహానుభావులు అందరికి వందనములు
YYR

Message #17 received at 11868 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Yagnesh Raghava Yakkala <hi <at> yagnesh.org>
Cc: Glenn Morris <rgm <at> gnu.org>, 11868 <at> debbugs.gnu.org
Subject: Re: bug#11868: 24.1.50;
	[python-mode] Blocking call to accept-process-output with quit
	inhibited!! (message buffer)
Date: Tue, 10 Jul 2012 18:58:19 -0400

> with some trail and error, the following patch is suppressing the warning.

Thank you for your attempt at finding a patch that works.  The problem
is that the warning is there to indicate that there is a "fundamental"
problem, and your patch mostly hides the problem.  Maybe it actually
solves it, but maybe not.
It depends on whether the surrounding code is prepared to deal with
accept-process-output being interrupted by quit.
IOW, we have to either find or create a place where the code is prepared
to handle an interruption by quit.


        Stefan


> diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
> index ddedbdb..d6bb724 100644
> --- a/lisp/progmodes/python.el
> +++ b/lisp/progmodes/python.el
> @@ -1609,7 +1609,8 @@ the output."
>                        (setq output-buffer (concat output-buffer string))
>                        "")))))
>      (python-shell-send-string string process msg)
> -    (accept-process-output process)
> +    (with-local-quit
> +      (accept-process-output process))
>      (replace-regexp-in-string
>       (if (> (length python-shell-prompt-output-regexp) 0)
>           (format "\n*%s$\\|^%s\\|\n$"




> Thanks.,
> -- 
> ఎందరో మహానుభావులు అందరికి వందనములు
> YYR

Message #20 received at 11868 <at> debbugs.gnu.org (full text, mbox):

From: Yagnesh Raghava Yakkala <hi <at> yagnesh.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 11868 <at> debbugs.gnu.org
Subject: Re: bug#11868: 24.1.50;
	[python-mode] Blocking call to accept-process-output with quit
	inhibited!! (message buffer)
Date: Fri, 13 Jul 2012 02:52:02 +0900

Hello Stefan,

thanks for reply.,

Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:

>> with some trail and error, the following patch is suppressing the warning.
>
> Thank you for your attempt at finding a patch that works.  The problem
> is that the warning is there to indicate that there is a "fundamental"
> problem, and your patch mostly hides the problem.  Maybe it actually
> solves it, but maybe not.
> It depends on whether the surrounding code is prepared to deal with
> accept-process-output being interrupted by quit.
> IOW, we have to either find or create a place where the code is prepared
> to handle an interruption by quit.

I could understand what you are saying, but have no clue what to do further. It
would be great if you can guide me to the next step to resolve the issue.

Thanks.,
-- 
ఎందరో మహానుభావులు అందరికి వందనములు
YYR

Message #23 received at 11868 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Yagnesh Raghava Yakkala <hi <at> yagnesh.org>
Cc: 11868 <at> debbugs.gnu.org
Subject: Re: bug#11868: 24.1.50;
	[python-mode] Blocking call to accept-process-output with quit
	inhibited!! (message buffer)
Date: Thu, 12 Jul 2012 20:17:42 -0400

>>> with some trail and error, the following patch is suppressing the warning.
>> 
>> Thank you for your attempt at finding a patch that works.  The problem
>> is that the warning is there to indicate that there is a "fundamental"
>> problem, and your patch mostly hides the problem.  Maybe it actually
>> solves it, but maybe not.
>> It depends on whether the surrounding code is prepared to deal with
>> accept-process-output being interrupted by quit.
>> IOW, we have to either find or create a place where the code is prepared
>> to handle an interruption by quit.

> I could understand what you are saying, but have no clue what to do
> further.  It would be great if you can guide me to the next step to
> resolve the issue.

Maybe python.el's maintainer will be better placed for that.
But basically, what is needed is to think first about what should happen
if the user hits C-g in the middle of this accept-process-output: what
can the user mean by that (there might be various cases), what should
the resulting behavior be, and then how to change the code to get
that result.

E.g. a typical problematic issues is the state of the process: the
process will presumably keep running, so what will happen next time
python.el wants to send it more commands?

I don't know enough about python.el's code to be able to answer.


        Stefan

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