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bug#18052: 24.3; python.el and ipython shell

From: Federico Beffa
Subject: bug#18052: 24.3; python.el and ipython shell
Date: Fri, 18 Jul 2014 15:51:47 +0200

I'm trying to use the ipython shell from within emacs. To do so I've
followed the instructions at the top of python.el and added the
following code to my .emacs:

 python-shell-interpreter "C:/Anaconda/python.exe"
   "-i C:/Anaconda/Scripts/ipython-script.py console --matplotlib=qt"
 python-shell-prompt-regexp "In \\[[0-9]+\\]: "
 python-shell-prompt-output-regexp "Out\\[[0-9]+\\]: "
   "from IPython.core.completerlib import module_completion"

When I execute (M-x) run-python, SOMETIMES the session does not
initialize properly and the new buffer looks like this:

Python 2.7.6 |Anaconda 2.0.1 (64-bit)| (default, Nov 11 2013,
10:49:15) [MSC v.1500 64 bit (AMD64)]
Type "copyright", "credits" or "license" for more information.

IPython 2.1.0 -- An enhanced Interactive Python.
Anaconda is brought to you by Continuum Analytics.
Please check out: http://continuum.io/thanks and https://binstar.org
?         -> Introduction and overview of IPython's features.
%quickref -> Quick reference.
help      -> Python's own help system.
object?   -> Details about 'object', use 'object??' for extra details.

In [1]:

The difference compared to the situation when everything is well, is
that here I only see "In [1]:", while normally I should see 4 empty
input prompts, with the last one reading "In [4]". When I execute any
command such as "1+1" and press RET, nothing happens.

This happens starting emacs with the -Q option and executing the ipython
customization in the *scratch* buffer.

By running the debugger I've found out that emacs sends some commands to
the inferior python shell with (comint-send-string ...) and tries to
hide them from the user. That appears to be the reason for the four
empty prompts.

Looking at the running processes I've noted that there are 2 python
processes running. The task manager reports one as:
c:\Anaconda\python.exe -c"from IPython.kernel.zmq.kernelapp import main;
main()" -f
--matplotlib=qt --IPKernelApp.parent_appname='ipython-console'
--interrupt=692 --parent=696

(Obviously the value of the last two arguments change everytime.)
If I kill this process, the inferior python shell asks:

"kernel died, restart ([y]/n)? kernel died, restart ([y]/n)? kernel
died, restart ([y]/n)?"

If I press y the process is restarted and the inferior python shell
works fine (or at least responds to the commands like 1+1 that I've

I would greatly appreciate any suggestion on how to further dig into
debugging and solve this intermittent problem.

Thank you in advance for your help.

In GNU Emacs 24.3.1 (i386-mingw-nt6.1.7601)
 of 2013-03-17 on MARVIN
Windowing system distributor `Microsoft Corp.', version 6.1.7601
Configured using:
 `configure --with-gcc (4.7) --cflags

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252
  default enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  show-paren-mode: t
  tooltip-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<help-echo> C-x C-r C-SPC C-a C-w c : / p r o <tab>
SPC <tab> SPC <tab> e m <tab> 3 <tab> s i <tab> s i
<tab> d <tab> f <tab> <return> <next> <next> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <down> <down> <down> C-SPC
<down> <down> <down> <down> <down> <down> <down> <down>
<down> <down> <down> <down> <left> M-w C-x b <return>
C-y M-x s h o w - p a <tab> <return> C-x C-e M-x r
u n - p y <tab> <return> C-x k <return> y e s <return>
C-x 0 M-x r u n - p <tab> y <tab> <return> <help-echo>
<help-echo> C-x o M-x r e p o <tab> r <tab> <retur

Recent messages:
Sent python-shell-completion-setup-code
Sent python-ffap-setup-code
Sent python-eldoc-setup-code
Making completion list...
Sent python-shell-completion-setup-code
Sent python-ffap-setup-code
Sent python-eldoc-setup-code
Making completion list...

Load-path shadows:
None found.

(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils help-mode compile python rx easymenu comint ring
ansi-color cus-start cus-load paren time-date tooltip ediff-hook
vc-hooks lisp-float-type mwheel dos-w32 ls-lisp w32-common-fns
disp-table w32-win w32-vars 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 macroexp files text-properties overlay sha1 md5 base64 format
env code-pages mule custom widget hashtable-print-readable backquote
make-network-process w32 multi-tty emacs)

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