Customizing the python search path depending on source directory

[Peter Schwalm]

Peter Hansen <peter at engcorp.com> wrote in message news:<4dudnVzbRvwbyOjdRVn-sw at powergate.ca>...
> Peter Schwalm wrote:
> 
> ... can you confirm that you get identical results if in each
> place where you typed "test1.py" you instead typed the
> equivalent with, for example, "python test1.py"?
> 

I have run the programs with "python <scriptname>.py" now. For my
purposes the results look identical - the source directory is still
not accessible during the processing of sitecustomize.py.

Here are the outputs of the explicit invocations:

Invocation from source directory:


E:\temp>python test1.py
---> C:\Python23\lib\sitecustomize.pyc ...
----------------------------------------------------------------
python-version= 2.3.2 (#49, Oct 24 2003, 13:37:57) [MSC v.1200 32 bit
(Intel)]
argv=
sys.argv does still not exist!
sys.modules["__main__"]=
sys.modules["__main__"].__file__ does still not exist
sys.path=
00: C:\WINNT\System32\python23.zip
01: C:\Python23\Lib\site-packages\Pythonwin
02: C:\Python23\Lib\site-packages\win32
03: C:\Python23\Lib\site-packages\win32\lib
04: C:\Python23\Lib\site-packages
05: C:\Python23\DLLs
06: C:\Python23\lib
07: C:\Python23\lib\plat-win
08: C:\Python23\lib\lib-tk
09: C:\Python23
10: C:\Python23\lib\site-packages\PIL
----------------------------------------------------------------
<--- C:\Python23\lib\sitecustomize.pyc ...
---> test1.py ...
----------------------------------------------------------------
python-version= 2.3.2 (#49, Oct 24 2003, 13:37:57) [MSC v.1200 32 bit
(Intel)]
argv= ['test1.py']
sys.modules["__main__"]= test1.py
sys.path=
00: E:\temp
01: C:\WINNT\System32\python23.zip
02: C:\Python23\Lib\site-packages\Pythonwin
03: C:\Python23\Lib\site-packages\win32
04: C:\Python23\Lib\site-packages\win32\lib
05: C:\Python23\Lib\site-packages
06: C:\Python23\DLLs
07: C:\Python23\lib
08: C:\Python23\lib\plat-win
09: C:\Python23\lib\lib-tk
10: C:\Python23
11: C:\Python23\lib\site-packages\PIL
----------------------------------------------------------------
<--- test1.py ...

E:\temp>


Invocation from different directory:

E:\temp\sub1>python ..\test1.py
---> C:\Python23\lib\sitecustomize.pyc ...
----------------------------------------------------------------
python-version= 2.3.2 (#49, Oct 24 2003, 13:37:57) [MSC v.1200 32 bit
(Intel)]
argv=
sys.argv does still not exist!
sys.modules["__main__"]=
sys.modules["__main__"].__file__ does still not exist
sys.path=
00: C:\WINNT\System32\python23.zip
01: C:\Python23\Lib\site-packages\Pythonwin
02: C:\Python23\Lib\site-packages\win32
03: C:\Python23\Lib\site-packages\win32\lib
04: C:\Python23\Lib\site-packages
05: C:\Python23\DLLs
06: C:\Python23\lib
07: C:\Python23\lib\plat-win
08: C:\Python23\lib\lib-tk
09: C:\Python23
10: C:\Python23\lib\site-packages\PIL
----------------------------------------------------------------
<--- C:\Python23\lib\sitecustomize.pyc ...
---> ..\test1.py ...
----------------------------------------------------------------
python-version= 2.3.2 (#49, Oct 24 2003, 13:37:57) [MSC v.1200 32 bit
(Intel)]
argv= ['..\\test1.py']
sys.modules["__main__"]= ..\test1.py
sys.path=
00: E:\temp
01: C:\WINNT\System32\python23.zip
02: C:\Python23\Lib\site-packages\Pythonwin
03: C:\Python23\Lib\site-packages\win32
04: C:\Python23\Lib\site-packages\win32\lib
05: C:\Python23\Lib\site-packages
06: C:\Python23\DLLs
07: C:\Python23\lib
08: C:\Python23\lib\plat-win
09: C:\Python23\lib\lib-tk
10: C:\Python23
11: C:\Python23\lib\site-packages\PIL
----------------------------------------------------------------
<--- ..\test1.py ...

E:\temp\sub1>

By the way, *if I remember that correctly*: to be able to invoke
python scripts simply by name ("test1" instead of "python test1.py")
you have to do
two things:

1)  set the environment variable PATHEXT such that it contains
".py"(see sample output from set command)
   
   E:\temp>set pathext
   PATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.PY;.py;.pyw;
            .pyc;.pys;.pyo
   E:\temp>

2) associate the file extension ".py" with c:\python23\python.exe
right click a .py-file in explorer, select "open with" (my translation
of the german "oeffnen mit") select python.exe as application and
check "open always with".

Thank you in advance
Peter Schwalm