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bug#20237: Emacs built on Windows cannot figure out path correctly

From: Da Zhang
Subject: bug#20237: Emacs built on Windows cannot figure out path correctly
Date: Sat, 04 Apr 2015 16:15:46 -0400
User-agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

Hi Eli,

I set debug tag using C-u C-M-x on the definition of


but when I bring up the python shell using 

the python-shell-make-comint was not invoked. 
Any thoughts?

BTW, for using cygwin's environment under Windows Emacs, is cygwin-mount the only solution?
I enabled 
(require 'cygwin-mount)
in my .emacs, and the previous set up of using cygwin64/bin/bash as shell works.



On 4/4/2015 3:06 PM, Eli Zaretskii wrote:
Date: Sat, 04 Apr 2015 21:44:10 +0300
From: Eli Zaretskii <address@hidden>
Cc: address@hidden

Date: Sat, 04 Apr 2015 21:38:21 +0300
From: Eli Zaretskii <address@hidden>
Cc: address@hidden

I think you need to use this instead:

  (setq python-shell-interpreter "/cygdrive/C/Python27/Scripts/ipython")

Or something like that -- I don't use Cygwin, so I might be mistaken
about the exact format you need to use.
Actually, if you use this format, you'd probably also need to use
cygwin-mount as well.
There's probably one more issue here, and maybe this is the root cause
of the problem.  This part of the backtrace you posted:

  make-comint-in-buffer("Python" "*Python*" "c\\:/Python27/Scripts/ipython.exe" nil "-i" "--profile="" "--colors=Linux")
  apply(make-comint-in-buffer "Python" "*Python*" "c\\:/Python27/Scripts/ipython.exe" nil ("-i" "--profile="" "--colors=Linux"))
  python-shell-make-comint("c\\:/Python27/Scripts/ipython.exe -i --profile="" --colors=Linux" "Python" nil)
  run-python("c\\:/Python27/Scripts/ipython.exe -i --profile="" --colors=Linux")

seems to indicate that split-string-and-unquote, called by
python-shell-make-comint, fails to remove the backslash before the
colon.  I don't understand why this happens.  Can you see what's going
on inside python-shell-make-comint?

Fabián, can you help us out here?

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