Re: [Visualpython-users] Installing VPython5 on Ubuntu

[Bruce S. <Bru...@nc...>]

The issue is that until Ubuntu 9.04, the standard place for 3rd-party 
modules such as Visual was /usr/lib/python2.6/site-packages if you were 
using /usr/bin/python2.6, or else /usr/local/lib/python2.6/site-packages 
if you were using /usr/local/bin/python2.6.

As a result, the "autoconfigure" script for VPython places the Visual 
module in one of these site-packages locations, depending on whether in 
your configure statement you say "--prefix=/usr" or 
"--prefix=/usr/local" (the latter being the default).

However, starting with Ubuntu 9.04, 3rd-party packages are apparently 
supposed to be somewhere else (dist-packages), and there seems to be 
some confusion about what is the new convention. More seriously, 
site-packages is apparently no longer on Python's module search path. 
That is, Python doesn't look in site-packages to find modules. This is a 
problem because at present the autoconfigure procedure will install 
Visual in the specified site-packages, not dist-packages.

A possible scheme to deal with this is outlined in the comments you 
quote. The configure statement

PYTHON=/usr/bin/python ../vpython-core2/configure --prefix=/usr/local/lib

says "I'm using the python found in /usr/bin (which in Ubuntu 9.04 is 
equivalent to /usr/bin/python2.6), but I want the Visual module to be 
put in /usr/local/lib/site-packages".

And then you need to copy vpython-core2/src/gtk2/site-packages.pth to
/usr/lib/python2.6/dist-packages to put 
/usr/local/lib/python2.6/site-packages on the Python search path.

The contents of vpython-core2/src/gtk2/site-packages.pth is simply 
/usr/local/lib/python2.6/site-packages.

Bruce Sherwood

Matteo Malosio wrote:
> I'm trying to install VPython5 on Ubuntu but I've some doubt about the 
> "configure" process.
> I can't understand what is reported in the Install file:
> 
> "    There have been significant changes in where 3rd-party software is 
> stored on
>     Ubuntu 9.04. You probably want to use /usr/bin/python2.6 but store 
> the Visual
>     module in /usr/local/lib/python2.6/site-packages. To configure, do 
> this in a
>     folder parallel to vpython-core2:
>    
>     PYTHON=/usr/bin/python ../vpython-core2/configure 
> --prefix=/usr/local/lib
>    
>     You will also need to copy vpython-core2/src/gtk2/site-packages.pth to
>     /usr/lib/python2.6/dist-packages to put 
> /usr/local/lib/python2.6/site-packages
>     on the Python search path."
> 
> 
> Thank you!
> 
> Matteo
> 
> 
> 
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