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.
Best regards,
Simon
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