[Tutor] sound implementation problems

[Dave Angel]

On 06/14/2013 11:43 AM, Jim Mooney wrote:
> On 13 June 2013 21:53, Dave Angel <davea at davea.name> wrote:
>
>> On 06/13/2013 11:55 PM, Jim Mooney wrote:
>>
>>> Alan Gauld <alan.gauld at btinternet.com>
>>>
>>
> This is for my own convenience on my own machine. As a former webmaster I'm
> of course used to idiot-proofing anything released into the wild so it is
> usable by everyone on every machine ;')
>
> The script to change directories for PyScripter is a PyScripter startup
> file, not a bat file. I meant I needed an additional bat file that would do
> the same for MS-DOS.

You're not running MS-DOS.  You're running a DOS BOX under Windows, 
which is a cmd shell.

  As usual I was marvelously unclear. But anyway, I
> figured it out. Here is the batch for starting 2.7 and ensuring its in the
> 2.7 working directory. Since I'm running 2.7 and 3.3 I just want to make
> sure I don't trip over my own feet. I know I could do all this with
> virtualenv, but I'd rather a simple hack than all that mess. The two Pys
> are now separated in every possible way:
>
> MS batch file py27.bat
>
> python2.7 -i -c "import os;os.chdir('c:/python27/jimprogs');del(os)
>

That seems rather silly.  Why not

------py27.bat-------
c:
cd \python27\jimprogs
python2.7 %$
---------------------



I probably don't have the right syntax for %$, but there is a 
pseudo-variable you can use which means "all the parameters that were on 
the batch file invocation.  This is the generalization of %1 %2 %3 %4

There's also a pair of cmd.exe internal commands, with names something 
like  SETLOCAL and  ENDLOCAL    that let you save and restore the 
current state of the environment including drive letter and current 
directory.

------py27.bat-------
SETLOCAL
c:
cd \python27\jimprogs
python2.7 %$
ENDLOCAL
---------------------

Or you could use PUSHD and POPD if the only thing you're customizing is 
the directory.


-- 
DaveA