[Python-bugs-list] [ python-Bugs-410274 ] sys.prefix isn't always set
noreply@sourceforge.net
noreply@sourceforge.net
Mon, 26 Mar 2001 11:54:35 -0800
Bugs item #410274, was updated on 2001-03-21 01:58
You can respond by visiting:
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=410274&group_id=5470
Category: Python Interpreter Core
Group: Platform-specific
Status: Open
Priority: 6
Submitted By: Fredrik Lundh (effbot)
Assigned to: Mark Hammond (mhammond)
Summary: sys.prefix isn't always set
Initial Comment:
(2.0 and earlier, Windows only)
it looks like sys.prefix isn't set unless
1) PYTHONHOME is set (either via an environment
variable, or via a call to Py_SetPythonHome), or
2) lib/os.py (or lib/string.py, in 1.5.2) can be found
somewhere between the directory your executable is
found in, and the root.
if neither is set, the path is taken from the
registry, but sys.prefix is left blank, and code
depending on sys.prefix (e.g. FixTk.py) no longer
works.
</F>
----------------------------------------------------------------------
>Comment By: Fredrik Lundh (effbot)
Date: 2001-03-26 11:54
Message:
Logged In: YES
user_id=38376
InstallPath?
(I'd deprecate InstallPath, teach the installers to
use PythonHome as a fallback, and use PythonHome for
this purpose. but that's me)
----------------------------------------------------------------------
Comment By: Mark Hammond (mhammond)
Date: 2001-03-21 13:44
Message:
Logged In: YES
user_id=14198
The main problem here is exactly how to detect it.
If the executable is not in the Python directory there are
no reasonable hints. The DLL is always in the system
directory. The core path entries may not may not be in the
home.
But 228685 depends on this too.
The only solution I can come up with is to use the core
sys.path entries, and one at a time try and see if the root
could be the parent of one of them. Any other ideas? I
would prefer to not assume another registry entry is
written by installers.
I will try and write registry docs soon, but this isn't
really relevant - I agree that sys.prefix should always be
set, but just not sure how.
----------------------------------------------------------------------
Comment By: Tim Peters (tim_one)
Date: 2001-03-21 10:19
Message:
Logged In: YES
user_id=31435
Boosted priority a notch. Mark, is this intentional or a
bug? You're a bit overdue in writing up the intended rules
for Windows, and I'm very reluctant to go changing things
like this myself in the absence of clarity.
----------------------------------------------------------------------
You can respond by visiting:
http://sourceforge.net/tracker/?func=detail&atid=105470&aid=410274&group_id=5470