Running python from a usb drive

**Jordan** · Sep 11 '06, 06:55 PM

Re: Running python from a usb drive

If making a usb version of python was that easy, movable python would
be open source. Check out http://www.voidspace.org.uk/python/movpy/ if
you need a portable usb version of python for work or something.
Copying the Python24 directory is a good start, but doesn't include the
enormous number of registry keys that are included in the install and
are probably needed for the complete capabilites of python. I really
hope I didn't missunderstand what you were asking about -_-;
Environmental Variables? Try setting the user/system variable
"pythonpath "
cjl wrote:

Hey:
>
I am trying to run python from a usb drive under windows xp. I
installed python "for this user" on to a machine, then copied the
entire Python24 directory to the usb drive.
>
I have the following in a batch file at the root of the drive:
>
@path=%PATH%;%C D%Python24;%CD% Python24\libs;% CD%Python24\Scr ipts;%CD%Python 24\Lib\site-packages;%CD%Py thon24\DLLs
@set pythonpath = %CD%Python24
@cmd
>
When I double click the file and type 'python' at the prompt I am in a
working python environment, and I am able to import modules in the
site-packages directory (in this case, django).
>
However, when I run a script directly from the cmd prompt (in this case
'django-admin.py' the script runs, but fails to import modules from the
site-packages directory.
>
Is there a command line option to python.exe or an environment variable
I can set to remedy this?
>
Any other thoughts?
>
Thanks in advance,
CJL

**cjl** · Sep 11 '06, 07:25 PM

Re: Running python from a usb drive

Jordan:

Thank you for your reply.

If making a usb version of python was that easy, movable python would
be open source.

I knew about movable python, but I'm not using it because it's not open
source. I guess those guys but some work into it, and feel like a small
fee is appropriate, but I guess I would rather use something open, even
if it means I have to make it myself.

Copying the Python24 directory is a good start, but doesn't include the
enormous number of registry keys that are included in the install and
are probably needed for the complete capabilites of python.

Is the source of the windows python installer available? I guess I
could see what registry keys they are setting...

Environmental Variables? Try setting the user/system variable "pythonpath "

I do set pythonpath, see above.

Any other ideas?

Thanks again,
CJL

**Uwe Hoffmann** · Sep 11 '06, 07:55 PM

Re: Running python from a usb drive

cjl schrieb:

>
>
I do set pythonpath, see above.
>

is pythonpath really case insensitive on windows ?

**Steve Holden** · Sep 11 '06, 08:25 PM

Re: Running python from a usb drive

Uwe Hoffmann wrote:

cjl schrieb:
>
>

>>
>>I do set pythonpath, see above.
>>

>
is pythonpath really case insensitive on windows ?

Only because the Windows filesystem implements case-insensitive
semantics. This is nothing to do with Python:

C:\Steve\Projec ts\Python\dbimp >dir DB.py
Volume in drive C has no label.
Volume Serial Number is 9CA8-2A02

Directory of C:\Steve\Projec ts\Python\dbimp

01/19/2005 06:03 PM 136 db.py
1 File(s) 136 bytes
0 Dir(s) 15,908,880,384 bytes free

C:\Steve\Projec ts\Python\dbimp >dir db.py
Volume in drive C has no label.
Volume Serial Number is 9CA8-2A02

Directory of C:\Steve\Projec ts\Python\dbimp

01/19/2005 06:03 PM 136 db.py
1 File(s) 136 bytes
0 Dir(s) 15,908,880,384 bytes free

regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC/Ltd http://www.holdenweb.com
Skype: holdenweb http://holdenweb.blogspot.com
Recent Ramblings http://del.icio.us/steve.holden

**Uwe Hoffmann** · Sep 11 '06, 08:25 PM

Re: Running python from a usb drive

Steve Holden schrieb:

Uwe Hoffmann wrote:
>

>cjl schrieb:
>>
>>

>>>
>>I do set pythonpath, see above.
>>>

>>
>is pythonpath really case insensitive on windows ?

>
>
Only because the Windows filesystem implements case-insensitive
semantics. This is nothing to do with Python:

no, i mean't the name not the content. Is the handling of the
env variable pythonpath case insensitive: pythonpath <--PYTHONPATH.

regards
uwe

**cjl** · Sep 11 '06, 08:25 PM

Re: Running python from a usb drive

Uwe:

Thank you for your reply.

is pythonpath really case insensitive on windows ?

I think so. After running my batch file, I can load the python
interpreter by typing 'python', and can then type 'import django'
without error. This lives in the site-packages directory, so it is
finding it.

However, there is a python script that lives in python24\Script s called
'django-admin.py', which I am adding to my path. When I type
'django-admin.py --help' I get an error that it couldn't load the
django module. When I type 'python E:\python24\dja ngo-admin.py --help'
I get the correct output, and no errors, so I know it is loading the
module.

I guess I am trying to figure out why, and what the top "shebang" line
should be for the script django-admin.py, because the removable drive
can have different drive letters, so I can't hard code it.

thanks again,
CJL

**Steve Holden** · Sep 11 '06, 09:35 PM

Re: Running python from a usb drive

Uwe Hoffmann wrote:

Steve Holden schrieb:
>

>>Uwe Hoffmann wrote:
>>
>>

>>>cjl schrieb:
>>>
>>>
>>>
>>>>I do set pythonpath, see above.
>>>>
>>>
>>>is pythonpath really case insensitive on windows ?

>>
>>
>>Only because the Windows filesystem implements case-insensitive
>>semantics. This is nothing to do with Python:

>
>
no, i mean't the name not the content. Is the handling of the
env variable pythonpath case insensitive: pythonpath <--PYTHONPATH.
>

You live and learn. Apparently it is:

C:\Steve\Projec ts\Python\dbimp >set SCREWUP="This is Windows"

C:\Steve\Projec ts\Python\dbimp >python
Python 2.4.2 (#67, Sep 28 2005, 12:41:11) [MSC v.1310 32 bit (Intel)] on
win32
Type "help", "copyright" , "credits" or "license" for more information.
Started with C:/Steve/.pythonrc

>>import os; print os.environ["screwup"]

"This is Windows"

>>>

It turns out that there's code in os.py specifically for os2 and NT
systems, wherein a subclass of userDict is declared that used
case-insensitive pattern matching:

>>os.environ.__ class__

>>>

regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC/Ltd http://www.holdenweb.com
Skype: holdenweb http://holdenweb.blogspot.com
Recent Ramblings http://del.icio.us/steve.holden

**Thorsten Kampe** · Sep 11 '06, 11:05 PM

Re: Running python from a usb drive

* cjl (2006-09-11 20:34 +0100)

>Copying the Python24 directory is a good start, but doesn't include the
>enormous number of registry keys that are included in the install and
>are probably needed for the complete capabilites of python.

>
Is the source of the windows python installer available? I guess I
could see what registry keys they are setting...

Simply installing Python would be about one hundred times faster...

>Environmenta l Variables? Try setting the user/system variable "pythonpath "

>
I do set pythonpath, see above.
>
Any other ideas?

Use Cywin Python.

**Thorsten Kampe** · Sep 11 '06, 11:15 PM

Re: Running python from a usb drive

* Steve Holden (2006-09-11 21:37 +0100)

Uwe Hoffmann wrote:

>cjl schrieb:

>>>I do set pythonpath, see above.

>>
>is pythonpath really case insensitive on windows ?

>
Only because the Windows filesystem implements case-insensitive
semantics. This is nothing to do with Python:

That's nonsense: "Filenames are Case Sensitive on NTFS Volumes"[1]

Thorsten
[1] http://support.microsoft.com/kb/100625/en-us

**Steve Holden** · Sep 12 '06, 12:15 AM

Re: Running python from a usb drive

Thorsten Kampe wrote:

* Steve Holden (2006-09-11 21:37 +0100)
>

>>Uwe Hoffmann wrote:
>>

>>>cjl schrieb:
>>>
>>>>I do set pythonpath, see above.
>>>
>>>is pythonpath really case insensitive on windows ?

>>
>>Only because the Windows filesystem implements case-insensitive
>>semantics. This is nothing to do with Python:

>
>
That's nonsense: "Filenames are Case Sensitive on NTFS Volumes"[1]
>
Thorsten
[1] http://support.microsoft.com/kb/100625/en-us

Sigh. Right, the semantics are actually inside the subsystem accessing
the filesystem, if I have to dot every I and cross every T. Note that
the reference you quote includes the test """However, if you attempt to
open one of these files in a Win32 application, such as Notepad, you
would only have access to one of the files, regardless of the case of
the filename you type in the Open File dialog box."""

So perhaps I should have said the Win32 API implements case-insensitive
semantics? Sure, if you want to use the POSIX compatibility layer it's
absolutely possible to create several files that Win32 applications will
be completely unable to distinguish between. Whatever good that might do
you.

Sheesh, the nits that get picked on this list nowadays. I can remember
when it used to be fun, not an exercise in ego inflation.

regards
Steve
--
Steve Holden +44 150 684 7255 +1 800 494 3119
Holden Web LLC/Ltd http://www.holdenweb.com
Skype: holdenweb http://holdenweb.blogspot.com
Recent Ramblings http://del.icio.us/steve.holden

**Thorsten Kampe** · Sep 12 '06, 12:55 AM

Re: Running python from a usb drive

* Steve Holden (2006-09-12 01:30 +0100)

Thorsten Kampe wrote:

>* Steve Holden (2006-09-11 21:37 +0100)

>>>Uwe Hoffmann wrote:
>>>>cjl schrieb:
>>>>
>>>>>I do set pythonpath, see above.
>>>>
>>>>is pythonpath really case insensitive on windows ?
>>>
>>>Only because the Windows filesystem implements case-insensitive
>>>semantics. This is nothing to do with Python:

>>
>That's nonsense: "Filenames are Case Sensitive on NTFS Volumes"[1]
>>
>Thorsten
>[1] http://support.microsoft.com/kb/100625/en-us

>
Sigh. Right, the semantics are actually inside the subsystem accessing
the filesystem, if I have to dot every I and cross every T. Note that
the reference you quote includes the test """However, if you attempt to
open one of these files in a Win32 application, such as Notepad, you
would only have access to one of the files, regardless of the case of
the filename you type in the Open File dialog box."""
>
So perhaps I should have said the Win32 API implements case-insensitive
semantics? Sure, if you want to use the POSIX compatibility layer it's
absolutely possible to create several files that Win32 applications will
be completely unable to distinguish between. Whatever good that might do
you.
>
Sheesh, the nits that get picked on this list nowadays. I can remember
when it used to be fun, not an exercise in ego inflation.

It's exactly the same issue as with the environment variables: "You
live and learn."[1]

Thorsten
[1] http://groups.google.com/group/comp....9fa3ce96e757b3

**cjl** · Sep 12 '06, 01:25 AM

Re: Running python from a usb drive

Hey all:

I'm getting closer. My startpython.bat file is now:

path=%PATH%;%CD %Python24;%CD%P ython24\libs;%C D%Python24\Scri pts;%CD%Python2 4\Lib\site-packages;%CD%Py thon24\DLLs
set PYTHONPATH=%CD% Python24
ASSOC .py=Python.File
ASSOC .pyc=Python.Com piledFile
ASSOC .pyo=Python.Com piledFile
ASSOC .pyw=Python.NoC onFile
FTYPE Python.File=%CD %Python24\pytho n.exe "%1" %*
FTYPE Python.Compiled File=%CD%Python 24\python.exe "%1" %*
FTYPE Python.NoConFil e=%CD%Python24\ pythonw.exe "%1" %*
set PATHTEXT=%PATHT EXT%;.py;.pyc;. pyo;.pyw
cmd

I am having a problem with the ftype commands as written above. If I
type them from the command line exactly like above they work. But for
some reason they do not work from my batch file. Anyone familiar with
bath file syntax that can help me? I am very close here...

Thanks again,
CJL

**cjl** · Sep 12 '06, 01:45 AM

Re: Running python from a usb drive

Hey all:

It seems no matter what I do the %1 gets replaced by paramaters sent to
the batch file...there must be some way of "escaping" this, but I can't
find the answer (yet) with google. Anyone?

-CJL

**Jason** · Sep 12 '06, 02:25 AM

Re: Running python from a usb drive

cjl wrote:

Hey all:
>
It seems no matter what I do the %1 gets replaced by paramaters sent to
the batch file...there must be some way of "escaping" this, but I can't
find the answer (yet) with google. Anyone?
>
-CJL

Use two percents in a row turn into a single percentage sign. So you'd
want "%%1".

--Jason

Running python from a usb drive

Running python from a usb drive

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