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Date: Mon, 18 Jul 2005 06:23:56 -0700
From: Jerry McRae <crxxtc@gmail.com>
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To: "Fernando Perez Fernando.Perez-at-colorado.edu |Python projects/jml|"
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Subject: Re: [IPython-user] Re[2]: IPython install under Win2000
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Hi Fernando,

You <F> wrote on Sunday (7/17/2005 at 7:38 PM) thus about [IPython-user] Re[2]: IPython install under Win2000:

F> Well, the fix is easy enough to apply.  However, it smells a bit fishy to me:
F> why would an environment variable resolve to something else which needs to be
F> re-expanded?  I know that under Windows all kinds of bizarre things are
F> considered normal, but this I find a bit odd.  Environment variables are, at
F> least in my mind, end-values which should be usable as-is.

I agree.

F> So I'd like to hear from those with Win32 expertise if this is really standard
F> practice in the win32 world I should code defensively against.  And if so,  is
F> one level of re-evaluation enough?  Can %USERPROFILE% itself point to
F> %SOMETHINGELSESTILL%? Should I keep expanding all %XXX% forms?

I have been using DOS/Windows since 1983.  I have been using WinXP for
the past several years.  I have no experience with Win2000 or Win ME.
I am not an expert on environment variable standards, and if there
were any, I'm sure Microsoft would violate them.

That being said, I have *never* seen *any* environment variables that
need re-expanding. In fact one cannot set any environment variable to
a macro (I.E. %anothername%) from the command line or a batch file
because the macro will be expanded before assigning the environment
variable.  That would be possible only from a program.  I would
consider that an aberration and any program that does not play by the
same unwritten rules as everyone else.

But then again, I don't know what weirdness Win2000 introduced. Does
anyone know *for sure* what the environment variables look like in a
virgin Win2000 install?

In WinXP Home and Pro there is a USERPROFILE and a HOMEPATH (which is
used as a starting directory when running cmd.exe), but no HOME. So
any HOME environment variable was added by customizing or by another
application.

my $.03
-- 
Jerry
___________________________
A little experience often upsets a lot of theory. -- Cadman


=========
(Python 2.3.5, IPython 0.6.13, Windows XP)


]