On May 30, 2009, at 11:40 AM, [email protected] wrote:

> Dear Laurent,
>
> I think the idea is that Sage is "with batteries included" and should
> not interfere with anything that you have on your system. Namely,
> since Sage is rather big, it is very probable that Sage ships
> something that is already installed on your computer -- in your case,
> Python. So, either the installation of Sage would nuke your Python (I
> guess you wouldn't be happy about it...), or during installation, Sage
> should try to find things on your system and try to use them. AFAIK,
> that would frankly be impossible, in such a complicated system.
>
> On the dark side, you need to re-install all your Python packages. On
> the bright side, it shouldn't be difficult. Sage also provides its own
> shell, that you can obtain by the command
>    sage -sh
> In the Sage shell, the PATH points to the things that were installed
> by Sage. Hence, when you run Python inside the Sage shell, then it is
> Sage's Python. Start the Sage shell, install a Python package, and
> quit the Sage shell, then afterwards you should be able to use the
> package in Sage.

Note you can also do

sage -python

to run Sage's Python. Thus to install packages, you can do stuff like

sage -python setup.py install

- Robert



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