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

[Andy Moreton]

On Tue 31 Mar 2015, Eli Zaretskii wrote:

>> Date: Tue, 31 Mar 2015 13:52:20 -0400
>> From: Da Zhang <zhangda82@gmail.com>
>> 
>> I am using Python mode in Emacs and wanted to start a python
>> sub-process.
>> However, Emacs could not find python.exe from the path I specified.
>> Particularly, the following message was displayed:
>> apply: Searching for program: no such file or directory,
>> c\:/Python27/Scripts/ipython.exeInvalid face reference: python-cell
>> 
>> It seemed a "C\:" was added in front of the path to the python.
>
> You didn't say which path of Python did you specify, and how didyou
> specify it.  Please tell, otherwise it's very hard to figure out the
> reason for the problem.

I have seen something similar - I think it's caused by incorrect
quoting:

--[python.el]-----------------------------------------------------------
(defun python-shell-calculate-command ()
  "Calculate the string used to execute the inferior Python process."
  (let ((exec-path (python-shell-calculate-exec-path)))
    ;; `exec-path' gets tweaked so that virtualenv's specific
    ;; `python-shell-interpreter' absolute path can be found by
    ;; `executable-find'.
    (format "%s %s"
            ;; FIXME: Why executable-find?
            (shell-quote-argument
             (executable-find python-shell-interpreter))
            python-shell-interpreter-args)))
--[python.el]-----------------------------------------------------------

Removing the use of shell-quote-argument seems to work around this
problem.

    AndyM